400709925 has 144 divisors (see below), whose sum is σ = 907620480. Its totient is φ = 164160000.

The previous prime is 400709923. The next prime is 400709929. The reversal of 400709925 is 529907004.

It is not a de Polignac number, because 400709925 - 2¹ = 400709923 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400709925.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400709923) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1749711 + ... + 1749939.

It is an arithmetic number, because the mean of its divisors is an integer number (6302920).

Almost surely, 2^400709925 is an apocalyptic number.

400709925 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

400709925 is an abundant number, since it is smaller than the sum of its proper divisors (506910555).

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

400709925 is a wasteful number, since it uses less digits than its factorization.

400709925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364 (or 356 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 400709925 is about 20017.7402570820. The cubic root of 400709925 is about 737.2419397801.

The spelling of 400709925 in words is "four hundred million, seven hundred nine thousand, nine hundred twenty-five".