402864861 has 32 divisors (see below), whose sum is σ = 656494848. Its totient is φ = 214502400.

The previous prime is 402864851. The next prime is 402864877. The reversal of 402864861 is 168468204.

It is not a de Polignac number, because 402864861 - 2¹⁹ = 402340573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402864851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30471 + ... + 41643.

It is an arithmetic number, because the mean of its divisors is an integer number (20515464).

Almost surely, 2^402864861 is an apocalyptic number.

It is an amenable number.

402864861 is a deficient number, since it is larger than the sum of its proper divisors (253629987).

402864861 is a wasteful number, since it uses less digits than its factorization.

402864861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11301.

The product of its (nonzero) digits is 73728, while the sum is 39.

The square root of 402864861 is about 20071.4937411245. The cubic root of 402864861 is about 738.5611565488.

The spelling of 402864861 in words is "four hundred two million, eight hundred sixty-four thousand, eight hundred sixty-one".