400557428 has 12 divisors (see below), whose sum is σ = 707179620. Its totient is φ = 198506112.

The previous prime is 400557403. The next prime is 400557457. The reversal of 400557428 is 824755004.

It can be written as a sum of positive squares in 2 ways, for example, as 8596624 + 391960804 = 2932^2 + 19798^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 442643 + ... + 443546.

It is an arithmetic number, because the mean of its divisors is an integer number (58931635).

Almost surely, 2^400557428 is an apocalyptic number.

It is an amenable number.

400557428 is a deficient number, since it is larger than the sum of its proper divisors (306622192).

400557428 is a wasteful number, since it uses less digits than its factorization.

400557428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886306 (or 886304 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 35.

The square root of 400557428 is about 20013.9308482867. The cubic root of 400557428 is about 737.1484045799.

The spelling of 400557428 in words is "four hundred million, five hundred fifty-seven thousand, four hundred twenty-eight".