402689428 has 24 divisors (see below), whose sum is σ = 736581888. Its totient is φ = 192266976.

The previous prime is 402689393. The next prime is 402689429. The reversal of 402689428 is 824986204.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 56725 + ... + 63427.

It is an arithmetic number, because the mean of its divisors is an integer number (30690912).

Almost surely, 2^402689428 is an apocalyptic number.

It is an amenable number.

402689428 is a deficient number, since it is larger than the sum of its proper divisors (333892460).

402689428 is a wasteful number, since it uses less digits than its factorization.

402689428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7383 (or 7381 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The square root of 402689428 is about 20067.1230623625. The cubic root of 402689428 is about 738.4539354730.

The spelling of 402689428 in words is "four hundred two million, six hundred eighty-nine thousand, four hundred twenty-eight".