400120536 has 32 divisors (see below), whose sum is σ = 1017259200. Its totient is φ = 131112480.

The previous prime is 400120531. The next prime is 400120549. The reversal of 400120536 is 635021004.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400120531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139870 + ... + 142701.

It is an arithmetic number, because the mean of its divisors is an integer number (31789350).

Almost surely, 2^400120536 is an apocalyptic number.

It is an amenable number.

400120536 is an abundant number, since it is smaller than the sum of its proper divisors (617138664).

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

400120536 is a wasteful number, since it uses less digits than its factorization.

400120536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282639 (or 282635 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 400120536 is about 20003.0131730197. The cubic root of 400120536 is about 736.8803020321.

The spelling of 400120536 in words is "four hundred million, one hundred twenty thousand, five hundred thirty-six".