402643715 has 4 divisors (see below), whose sum is σ = 483172464. Its totient is φ = 322114968.

The previous prime is 402643679. The next prime is 402643723. The reversal of 402643715 is 517346204.

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 402643715 - 2¹² = 402639619 is a prime.

It is a super-2 number, since 2×402643715² = 324243922458002450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40264367 + ... + 40264376.

It is an arithmetic number, because the mean of its divisors is an integer number (120793116).

Almost surely, 2^402643715 is an apocalyptic number.

402643715 is a deficient number, since it is larger than the sum of its proper divisors (80528749).

402643715 is an equidigital number, since it uses as much as digits as its factorization.

402643715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80528748.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 402643715 is about 20065.9840277022. The cubic root of 402643715 is about 738.4259915045.

Adding to 402643715 its reverse (517346204), we get a palindrome (919989919).

The spelling of 402643715 in words is "four hundred two million, six hundred forty-three thousand, seven hundred fifteen".