40000000400 has 60 divisors (see below), whose sum is σ = 101752959492. Its totient is φ = 15058821120.

The previous prime is 40000000399. The next prime is 40000000421. The reversal of 40000000400 is 400000004.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 936849664 + 39063150736 = 30608^2 + 197644^2 .

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2934377 + ... + 2947976.

Almost surely, 2^40000000400 is an apocalyptic number.

40000000400 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40000000400 is an abundant number, since it is smaller than the sum of its proper divisors (61752959092).

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

40000000400 is a wasteful number, since it uses less digits than its factorization.

40000000400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5882388 (or 5882377 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 8.

Adding to 40000000400 its reverse (400000004), we get a palindrome (40400000404).

40000000400 divided by its reverse (400000004) gives a square (100 = 10²).

The spelling of 40000000400 in words is "forty billion, four hundred", and thus it is an aban number.