400055553 has 6 divisors (see below), whose sum is σ = 577858034. Its totient is φ = 266703696.

The previous prime is 400055519. The next prime is 400055567. The reversal of 400055553 is 355550004.

It can be written as a sum of positive squares in only one way, i.e., 233722944 + 166332609 = 15288^2 + 12897^2 .

It is not a de Polignac number, because 400055553 - 2⁸ = 400055297 is a prime.

It is a super-2 number, since 2×400055553² = 320088890972271618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400055503) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22225300 + ... + 22225317.

Almost surely, 2^400055553 is an apocalyptic number.

It is an amenable number.

400055553 is a deficient number, since it is larger than the sum of its proper divisors (177802481).

400055553 is a wasteful number, since it uses less digits than its factorization.

400055553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44450623 (or 44450620 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 27.

The square root of 400055553 is about 20001.3887767825. The cubic root of 400055553 is about 736.8404079828.

The spelling of 400055553 in words is "four hundred million, fifty-five thousand, five hundred fifty-three".