398174921 has 8 divisors (see below), whose sum is σ = 401064000. Its totient is φ = 395295120.

The previous prime is 398174911. The next prime is 398174951. The reversal of 398174921 is 129471893.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398174921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398174911) 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, 99326 + ... + 103256.

It is an arithmetic number, because the mean of its divisors is an integer number (50133000).

Almost surely, 2^398174921 is an apocalyptic number.

It is an amenable number.

398174921 is a deficient number, since it is larger than the sum of its proper divisors (2889079).

398174921 is a wasteful number, since it uses less digits than its factorization.

398174921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4639.

The product of its digits is 108864, while the sum is 44.

The square root of 398174921 is about 19954.3208604051. The cubic root of 398174921 is about 735.6839829755.

The spelling of 398174921 in words is "three hundred ninety-eight million, one hundred seventy-four thousand, nine hundred twenty-one".