400135552 has 32 divisors (see below), whose sum is σ = 808390800. Its totient is φ = 197245440.

The previous prime is 400135537. The next prime is 400135559. The reversal of 400135552 is 255531004.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400135559) 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, 12927 + ... + 31102.

Almost surely, 2^400135552 is an apocalyptic number.

It is an amenable number.

400135552 is an abundant number, since it is smaller than the sum of its proper divisors (408255248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400135552 is an equidigital number, since it uses as much as digits as its factorization.

400135552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44114 (or 44102 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 400135552 is about 20003.3885129495. The cubic root of 400135552 is about 736.8895199678.

Adding to 400135552 its reverse (255531004), we get a palindrome (655666556).

The spelling of 400135552 in words is "four hundred million, one hundred thirty-five thousand, five hundred fifty-two".