400251642 has 16 divisors (see below), whose sum is σ = 914860992. Its totient is φ = 114357600.

The previous prime is 400251581. The next prime is 400251653. The reversal of 400251642 is 246152004.

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, 4764859 + ... + 4764942.

It is an arithmetic number, because the mean of its divisors is an integer number (57178812).

Almost surely, 2^400251642 is an apocalyptic number.

400251642 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

400251642 is an abundant number, since it is smaller than the sum of its proper divisors (514609350).

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

400251642 is a wasteful number, since it uses less digits than its factorization.

400251642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9529813.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 400251642 is about 20006.2900608784. The cubic root of 400251642 is about 736.9607768476.

The spelling of 400251642 in words is "four hundred million, two hundred fifty-one thousand, six hundred forty-two".