400038500 has 24 divisors (see below), whose sum is σ = 873685176. Its totient is φ = 160015200.

The previous prime is 400038491. The next prime is 400038511. The reversal of 400038500 is 5830004.

It can be written as a sum of positive squares in 4 ways, for example, as 8631844 + 391406656 = 2938^2 + 19784^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 399539 + ... + 400538.

It is an arithmetic number, because the mean of its divisors is an integer number (36403549).

Almost surely, 2^400038500 is an apocalyptic number.

It is an amenable number.

400038500 is an abundant number, since it is smaller than the sum of its proper divisors (473646676).

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

400038500 is a wasteful number, since it uses less digits than its factorization.

400038500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800096 (or 800084 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 400038500 is about 20000.9624768410. The cubic root of 400038500 is about 736.8299381718.

Adding to 400038500 its reverse (5830004), we get a palindrome (405868504).

The spelling of 400038500 in words is "four hundred million, thirty-eight thousand, five hundred".