400942157 has 24 divisors (see below), whose sum is σ = 521240832. Its totient is φ = 304785600.

The previous prime is 400942153. The next prime is 400942211. The reversal of 400942157 is 751249004.

It is a happy number.

It is not a de Polignac number, because 400942157 - 2² = 400942153 is a prime.

It is a super-2 number, since 2×400942157² = 321509226519625298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400942153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13028 + ... + 31170.

It is an arithmetic number, because the mean of its divisors is an integer number (21718368).

Almost surely, 2^400942157 is an apocalyptic number.

It is an amenable number.

400942157 is a deficient number, since it is larger than the sum of its proper divisors (120298675).

400942157 is a wasteful number, since it uses less digits than its factorization.

400942157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18209 (or 18202 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 400942157 is about 20023.5400716257. The cubic root of 400942157 is about 737.3843354758.

The spelling of 400942157 in words is "four hundred million, nine hundred forty-two thousand, one hundred fifty-seven".