400425553 has 4 divisors (see below), whose sum is σ = 436827888. Its totient is φ = 364023220.

The previous prime is 400425541. The next prime is 400425563. The reversal of 400425553 is 355524004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 400425553 - 2⁹ = 400425041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400425563) 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, 18201151 + ... + 18201172.

It is an arithmetic number, because the mean of its divisors is an integer number (109206972).

Almost surely, 2^400425553 is an apocalyptic number.

It is an amenable number.

400425553 is a deficient number, since it is larger than the sum of its proper divisors (36402335).

400425553 is a wasteful number, since it uses less digits than its factorization.

400425553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36402334.

The product of its (nonzero) digits is 12000, while the sum is 28.

The square root of 400425553 is about 20010.6359968893. The cubic root of 400425553 is about 737.0674988976.

Adding to 400425553 its reverse (355524004), we get a palindrome (755949557).

The spelling of 400425553 in words is "four hundred million, four hundred twenty-five thousand, five hundred fifty-three".