40040020400 has 30 divisors (see below), whose sum is σ = 96196149972. Its totient is φ = 16016008000.

The previous prime is 40040020343. The next prime is 40040020421. The reversal of 40040020400 is 402004004.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50049626 + ... + 50050425.

Almost surely, 2^40040020400 is an apocalyptic number.

40040020400 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40040020400 is an abundant number, since it is smaller than the sum of its proper divisors (56156129572).

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

40040020400 is a wasteful number, since it uses less digits than its factorization.

40040020400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100100069 (or 100100058 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

Adding to 40040020400 its reverse (402004004), we get a palindrome (40442024404).

The spelling of 40040020400 in words is "forty billion, forty million, twenty thousand, four hundred".