402266640 has 40 divisors (see below), whose sum is σ = 1247027328. Its totient is φ = 107271040.

The previous prime is 402266639. The next prime is 402266659. The reversal of 402266640 is 46662204.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 402266598 and 402266607.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 837816 + ... + 838295.

Almost surely, 2^402266640 is an apocalyptic number.

402266640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402266640 is an abundant number, since it is smaller than the sum of its proper divisors (844760688).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

402266640 is a wasteful number, since it uses less digits than its factorization.

402266640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1676127 (or 1676121 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 402266640 is about 20056.5859507544. The cubic root of 402266640 is about 738.1954080418.

The spelling of 402266640 in words is "four hundred two million, two hundred sixty-six thousand, six hundred forty".