400893843220 has 24 divisors (see below), whose sum is σ = 906636846024. Its totient is φ = 148022342016.

The previous prime is 400893843169. The next prime is 400893843247. The reversal of 400893843220 is 22348398004.

It can be written as a sum of positive squares in 4 ways, for example, as 4764588676 + 396129254544 = 69026^2 + 629388^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 770949439 + ... + 770949958.

It is an arithmetic number, because the mean of its divisors is an integer number (37776535251).

Almost surely, 2^400893843220 is an apocalyptic number.

It is an amenable number.

400893843220 is an abundant number, since it is smaller than the sum of its proper divisors (505743002804).

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

400893843220 is a wasteful number, since it uses less digits than its factorization.

400893843220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541899419 (or 1541899417 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 43.

The spelling of 400893843220 in words is "four hundred billion, eight hundred ninety-three million, eight hundred forty-three thousand, two hundred twenty".