400036800820 has 24 divisors (see below), whose sum is σ = 844298784000. Its totient is φ = 159210624672.

The previous prime is 400036800817. The next prime is 400036800827. The reversal of 400036800820 is 28008630004.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400036800827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50251900 + ... + 50259859.

It is an arithmetic number, because the mean of its divisors is an integer number (35179116000).

Almost surely, 2^400036800820 is an apocalyptic number.

It is an amenable number.

400036800820 is an abundant number, since it is smaller than the sum of its proper divisors (444261983180).

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

400036800820 is a wasteful number, since it uses less digits than its factorization.

400036800820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100511967 (or 100511965 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The spelling of 400036800820 in words is "four hundred billion, thirty-six million, eight hundred thousand, eight hundred twenty".