400552553 has 4 divisors (see below), whose sum is σ = 414364740. Its totient is φ = 386740368.

The previous prime is 400552531. The next prime is 400552561. The reversal of 400552553 is 355255004.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 153685609 + 246866944 = 12397^2 + 15712^2 .

It is a cyclic number.

It is not a de Polignac number, because 400552553 - 2⁶ = 400552489 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 13812157 = 400552553 / (4 + 0 + 0 + 5 + 5 + 2 + 5 + 5 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400552513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6906050 + ... + 6906107.

It is an arithmetic number, because the mean of its divisors is an integer number (103591185).

Almost surely, 2^400552553 is an apocalyptic number.

It is an amenable number.

400552553 is a deficient number, since it is larger than the sum of its proper divisors (13812187).

400552553 is a wasteful number, since it uses less digits than its factorization.

400552553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13812186.

The product of its (nonzero) digits is 15000, while the sum is 29.

The square root of 400552553 is about 20013.8090577481. The cubic root of 400552553 is about 737.1454140699.

The spelling of 400552553 in words is "four hundred million, five hundred fifty-two thousand, five hundred fifty-three".