400155143912 has 32 divisors (see below), whose sum is σ = 802727119200. Its totient is φ = 186439838400.

The previous prime is 400155143911. The next prime is 400155143917. The reversal of 400155143912 is 219341551004.

It is not an unprimeable number, because it can be changed into a prime (400155143911) 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, 21569414 + ... + 21587957.

It is an arithmetic number, because the mean of its divisors is an integer number (25085222475).

Almost surely, 2^400155143912 is an apocalyptic number.

It is an amenable number.

400155143912 is an abundant number, since it is smaller than the sum of its proper divisors (402571975288).

400155143912 is a wasteful number, since it uses less digits than its factorization.

400155143912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43157457 (or 43157453 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

Adding to 400155143912 its reverse (219341551004), we get a palindrome (619496694916).

The spelling of 400155143912 in words is "four hundred billion, one hundred fifty-five million, one hundred forty-three thousand, nine hundred twelve".