400203122320 has 20 divisors (see below), whose sum is σ = 930472259580. Its totient is φ = 160081248896.

The previous prime is 400203122317. The next prime is 400203122323. The reversal of 400203122320 is 23221302004.

It is an interprime number because it is at equal distance from previous prime (400203122317) and next prime (400203122323).

It can be written as a sum of positive squares in 2 ways, for example, as 277893448336 + 122309673984 = 527156^2 + 349728^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×400203122320² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (400203122323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2501269435 + ... + 2501269594.

It is an arithmetic number, because the mean of its divisors is an integer number (46523612979).

Almost surely, 2^400203122320 is an apocalyptic number.

400203122320 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400203122320 is an abundant number, since it is smaller than the sum of its proper divisors (530269137260).

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

400203122320 is a wasteful number, since it uses less digits than its factorization.

400203122320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5002539042 (or 5002539036 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 400203122320 its reverse (23221302004), we get a palindrome (423424424324).

The spelling of 400203122320 in words is "four hundred billion, two hundred three million, one hundred twenty-two thousand, three hundred twenty".