402370391 has 4 divisors (see below), whose sum is σ = 423547800. Its totient is φ = 381192984.

The previous prime is 402370387. The next prime is 402370411. The reversal of 402370391 is 193073204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 402370391 - 2² = 402370387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402370321) 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, 10588676 + ... + 10588713.

It is an arithmetic number, because the mean of its divisors is an integer number (105886950).

Almost surely, 2^402370391 is an apocalyptic number.

402370391 is a deficient number, since it is larger than the sum of its proper divisors (21177409).

402370391 is a wasteful number, since it uses less digits than its factorization.

402370391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21177408.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 402370391 is about 20059.1722411469. The cubic root of 402370391 is about 738.2588667204.

The spelling of 402370391 in words is "four hundred two million, three hundred seventy thousand, three hundred ninety-one".