3918121 has 8 divisors (see below), whose sum is σ = 4089344. Its totient is φ = 3749760.

The previous prime is 3918071. The next prime is 3918127. The reversal of 3918121 is 1218193.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3918121 - 2⁹ = 3917609 is a prime.

It is a Duffinian number.

3918121 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3918127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2356 + ... + 3658.

It is an arithmetic number, because the mean of its divisors is an integer number (511168).

Almost surely, 2^3918121 is an apocalyptic number.

3918121 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3918121 is a deficient number, since it is larger than the sum of its proper divisors (171223).

3918121 is a wasteful number, since it uses less digits than its factorization.

3918121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431.

The product of its digits is 432, while the sum is 25.

The square root of 3918121 is about 1979.4244112873. The cubic root of 3918121 is about 157.6495061432.

The spelling of 3918121 in words is "three million, nine hundred eighteen thousand, one hundred twenty-one".