400120537 has 4 divisors (see below), whose sum is σ = 400396240. Its totient is φ = 399844836.

The previous prime is 400120531. The next prime is 400120549. The reversal of 400120537 is 735021004.

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 a cyclic number.

It is not a de Polignac number, because 400120537 - 2²⁷ = 265902809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400120531) 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, 135663 + ... + 138580.

It is an arithmetic number, because the mean of its divisors is an integer number (100099060).

Almost surely, 2^400120537 is an apocalyptic number.

It is an amenable number.

400120537 is a deficient number, since it is larger than the sum of its proper divisors (275703).

400120537 is a wasteful number, since it uses less digits than its factorization.

400120537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275702.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 400120537 is about 20003.0131980159. The cubic root of 400120537 is about 736.8803026460.

The spelling of 400120537 in words is "four hundred million, one hundred twenty thousand, five hundred thirty-seven".