402888561 has 8 divisors (see below), whose sum is σ = 555708480. Its totient is φ = 259330512.

The previous prime is 402888553. The next prime is 402888571. The reversal of 402888561 is 165888204.

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

It is not a de Polignac number, because 402888561 - 2³ = 402888553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (402888511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2315365 + ... + 2315538.

It is an arithmetic number, because the mean of its divisors is an integer number (69463560).

Almost surely, 2^402888561 is an apocalyptic number.

It is an amenable number.

402888561 is a deficient number, since it is larger than the sum of its proper divisors (152819919).

402888561 is a wasteful number, since it uses less digits than its factorization.

402888561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4630935.

The product of its (nonzero) digits is 122880, while the sum is 42.

The square root of 402888561 is about 20072.0841219839. The cubic root of 402888561 is about 738.5756391192.

The spelling of 402888561 in words is "four hundred two million, eight hundred eighty-eight thousand, five hundred sixty-one".