400000022040 has 32 divisors (see below), whose sum is σ = 1200000066480. Its totient is φ = 106666672512.

The previous prime is 400000021997. The next prime is 400000022047. The reversal of 400000022040 is 40220000004.

It is a Harshad number since it is a multiple of its sum of digits (12).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400000022047) 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, 1666666639 + ... + 1666666878.

Almost surely, 2^400000022040 is an apocalyptic number.

400000022040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400000022040 is an abundant number, since it is smaller than the sum of its proper divisors (800000044440).

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

400000022040 is a wasteful number, since it uses less digits than its factorization.

400000022040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3333333531 (or 3333333527 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

Adding to 400000022040 its reverse (40220000004), we get a palindrome (440220022044).

The spelling of 400000022040 in words is "four hundred billion, twenty-two thousand, forty".