31400157 has 16 divisors (see below), whose sum is σ = 42495680. Its totient is φ = 20621952.

The previous prime is 31400143. The next prime is 31400167. The reversal of 31400157 is 75100413.

It is not a de Polignac number, because 31400157 - 2⁷ = 31400029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31400167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76569 + ... + 76977.

It is an arithmetic number, because the mean of its divisors is an integer number (2655980).

Almost surely, 2^31400157 is an apocalyptic number.

It is an amenable number.

31400157 is a deficient number, since it is larger than the sum of its proper divisors (11095523).

31400157 is a wasteful number, since it uses less digits than its factorization.

31400157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 31400157 is about 5603.5842993570. The cubic root of 31400157 is about 315.4839524924.

The spelling of 31400157 in words is "thirty-one million, four hundred thousand, one hundred fifty-seven".