400364538 has 16 divisors (see below), whose sum is σ = 915119040. Its totient is φ = 114389856.

The previous prime is 400364509. The next prime is 400364539. The reversal of 400364538 is 835463004.

It is a junction number, because it is equal to n+sod(n) for n = 400364499 and 400364508.

It is not an unprimeable number, because it can be changed into a prime (400364539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4766203 + ... + 4766286.

It is an arithmetic number, because the mean of its divisors is an integer number (57194940).

Almost surely, 2^400364538 is an apocalyptic number.

400364538 is an abundant number, since it is smaller than the sum of its proper divisors (514754502).

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

400364538 is a wasteful number, since it uses less digits than its factorization.

400364538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9532501.

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 400364538 is about 20009.1113745713. Note that the first 3 decimals coincide. The cubic root of 400364538 is about 737.0300600133.

The spelling of 400364538 in words is "four hundred million, three hundred sixty-four thousand, five hundred thirty-eight".