3621401869 has 4 divisors (see below), whose sum is σ = 3633046560. Its totient is φ = 3609757180.

The previous prime is 3621401857. The next prime is 3621401909. The reversal of 3621401869 is 9681041263.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9681041263 = 4273 ⋅2265631.

It is a cyclic number.

It is not a de Polignac number, because 3621401869 - 2⁵ = 3621401837 is a prime.

It is a super-2 number, since 2×3621401869² = 26229102993593386322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3621401569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5821879 + ... + 5822500.

It is an arithmetic number, because the mean of its divisors is an integer number (908261640).

Almost surely, 2^3621401869 is an apocalyptic number.

It is an amenable number.

3621401869 is a deficient number, since it is larger than the sum of its proper divisors (11644691).

3621401869 is a wasteful number, since it uses less digits than its factorization.

3621401869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11644690.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 3621401869 is about 60178.0846238895. The cubic root of 3621401869 is about 1535.6499871885.

The spelling of 3621401869 in words is "three billion, six hundred twenty-one million, four hundred one thousand, eight hundred sixty-nine".