402921887 has 4 divisors (see below), whose sum is σ = 402962136. Its totient is φ = 402881640.

The previous prime is 402921881. The next prime is 402921917. The reversal of 402921887 is 788129204.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 402921887 - 2¹⁰ = 402920863 is a prime.

It is a super-3 number, since 3×402921887³ (a number of 27 digits) contains 333 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 (402921881) 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, 7913 + ... + 29469.

It is an arithmetic number, because the mean of its divisors is an integer number (100740534).

Almost surely, 2^402921887 is an apocalyptic number.

402921887 is a deficient number, since it is larger than the sum of its proper divisors (40249).

402921887 is a wasteful number, since it uses less digits than its factorization.

402921887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40248.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 402921887 is about 20072.9142627572. The cubic root of 402921887 is about 738.5960029746.

The spelling of 402921887 in words is "four hundred two million, nine hundred twenty-one thousand, eight hundred eighty-seven".