6400090940 has 12 divisors (see below), whose sum is σ = 13440191016. Its totient is φ = 2560036368.

The previous prime is 6400090933. The next prime is 6400090951. The reversal of 6400090940 is 490900046.

It is a happy number.

It is a super-2 number, since 2×6400090940² = 81922328080540167200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 6400090897 and 6400090906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160002254 + ... + 160002293.

It is an arithmetic number, because the mean of its divisors is an integer number (1120015918).

Almost surely, 2^6400090940 is an apocalyptic number.

It is an amenable number.

6400090940 is an abundant number, since it is smaller than the sum of its proper divisors (7040100076).

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

6400090940 is a wasteful number, since it uses less digits than its factorization.

6400090940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320004556 (or 320004554 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 6400090940 is about 80000.5683729810. The cubic root of 6400090940 is about 1856.6443272803.

Adding to 6400090940 its reverse (490900046), we get a palindrome (6890990986).

The spelling of 6400090940 in words is "six billion, four hundred million, ninety thousand, nine hundred forty".