400555252 has 6 divisors (see below), whose sum is σ = 700971698. Its totient is φ = 200277624.

The previous prime is 400555231. The next prime is 400555273. The reversal of 400555252 is 252555004.

It is an interprime number because it is at equal distance from previous prime (400555231) and next prime (400555273).

It can be written as a sum of positive squares in only one way, i.e., 258373476 + 142181776 = 16074^2 + 11924^2 .

It is a super-4 number, since 4×400555252⁴ (a number of 36 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 400555252.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50069403 + ... + 50069410.

Almost surely, 2^400555252 is an apocalyptic number.

It is an amenable number.

400555252 is a deficient number, since it is larger than the sum of its proper divisors (300416446).

400555252 is a wasteful number, since it uses less digits than its factorization.

400555252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100138817 (or 100138815 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 28.

The square root of 400555252 is about 20013.8764860784. The cubic root of 400555252 is about 737.1470697419.

The spelling of 400555252 in words is "four hundred million, five hundred fifty-five thousand, two hundred fifty-two".