74242213 has 4 divisors (see below), whose sum is σ = 78609420. Its totient is φ = 69875008.

The previous prime is 74242211. The next prime is 74242279. The reversal of 74242213 is 31224247.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31224247 = 41 ⋅761567.

It can be written as a sum of positive squares in 2 ways, for example, as 36505764 + 37736449 = 6042^2 + 6143^2 .

It is a cyclic number.

It is not a de Polignac number, because 74242213 - 2¹ = 74242211 is a prime.

It is a super-2 number, since 2×74242213² = 11023812382274738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74242211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2183578 + ... + 2183611.

It is an arithmetic number, because the mean of its divisors is an integer number (19652355).

Almost surely, 2^74242213 is an apocalyptic number.

It is an amenable number.

74242213 is a deficient number, since it is larger than the sum of its proper divisors (4367207).

74242213 is a wasteful number, since it uses less digits than its factorization.

74242213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4367206.

The product of its digits is 2688, while the sum is 25.

The square root of 74242213 is about 8616.3921103905. The cubic root of 74242213 is about 420.2912058319.

The spelling of 74242213 in words is "seventy-four million, two hundred forty-two thousand, two hundred thirteen".