6638402 has 8 divisors (see below), whose sum is σ = 10278912. Its totient is φ = 3212100.

The previous prime is 6638393. The next prime is 6638407. The reversal of 6638402 is 2048366.

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

It is a super-2 number, since 2×6638402² = 88136762227208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6638407) 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, 53474 + ... + 53597.

It is an arithmetic number, because the mean of its divisors is an integer number (1284864).

Almost surely, 2^6638402 is an apocalyptic number.

6638402 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

6638402 is a deficient number, since it is larger than the sum of its proper divisors (3640510).

6638402 is a wasteful number, since it uses less digits than its factorization.

6638402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107104.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 6638402 is about 2576.5096545521. The cubic root of 6638402 is about 187.9408482988.

The spelling of 6638402 in words is "six million, six hundred thirty-eight thousand, four hundred two".