398373621 has 4 divisors (see below), whose sum is σ = 531164832. Its totient is φ = 265582412.

The previous prime is 398373617. The next prime is 398373637. The reversal of 398373621 is 126373893.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 398373621 - 2² = 398373617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398373421) 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, 66395601 + ... + 66395606.

It is an arithmetic number, because the mean of its divisors is an integer number (132791208).

Almost surely, 2^398373621 is an apocalyptic number.

It is an amenable number.

398373621 is a deficient number, since it is larger than the sum of its proper divisors (132791211).

398373621 is a wasteful number, since it uses less digits than its factorization.

398373621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132791210.

The product of its digits is 163296, while the sum is 42.

The square root of 398373621 is about 19959.2991109407. The cubic root of 398373621 is about 735.8063379929.

The spelling of 398373621 in words is "three hundred ninety-eight million, three hundred seventy-three thousand, six hundred twenty-one".