402689427 has 16 divisors (see below), whose sum is σ = 616197120. Its totient is φ = 229142592.

The previous prime is 402689393. The next prime is 402689429. The reversal of 402689427 is 724986204.

It is not a de Polignac number, because 402689427 - 2⁸ = 402689171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (402689429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35098 + ... + 45135.

It is an arithmetic number, because the mean of its divisors is an integer number (38512320).

Almost surely, 2^402689427 is an apocalyptic number.

402689427 is a deficient number, since it is larger than the sum of its proper divisors (213507693).

402689427 is a wasteful number, since it uses less digits than its factorization.

402689427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80482.

The product of its (nonzero) digits is 193536, while the sum is 42.

The square root of 402689427 is about 20067.1230374461. The cubic root of 402689427 is about 738.4539348618.

The spelling of 402689427 in words is "four hundred two million, six hundred eighty-nine thousand, four hundred twenty-seven".