402319591 has 4 divisors (see below), whose sum is σ = 404092152. Its totient is φ = 400547032.

The previous prime is 402319559. The next prime is 402319601. The reversal of 402319591 is 195913204.

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 402319591 - 2⁵ = 402319559 is a prime.

It is a super-2 number, since 2×402319591² = 323722106604814562, 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 (402319531) 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, 885940 + ... + 886393.

It is an arithmetic number, because the mean of its divisors is an integer number (101023038).

Almost surely, 2^402319591 is an apocalyptic number.

402319591 is a deficient number, since it is larger than the sum of its proper divisors (1772561).

402319591 is a wasteful number, since it uses less digits than its factorization.

402319591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1772560.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 402319591 is about 20057.9059475310. The cubic root of 402319591 is about 738.2277965674.

The spelling of 402319591 in words is "four hundred two million, three hundred nineteen thousand, five hundred ninety-one".