31402987 has 16 divisors (see below), whose sum is σ = 39283200. Its totient is φ = 24387840.

The previous prime is 31402979. The next prime is 31402993. The reversal of 31402987 is 78920413.

It is a cyclic number.

It is not a de Polignac number, because 31402987 - 2³ = 31402979 is a prime.

It is a super-2 number, since 2×31402987² = 1972295185044338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31402997) 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, 33339 + ... + 34267.

It is an arithmetic number, because the mean of its divisors is an integer number (2455200).

Almost surely, 2^31402987 is an apocalyptic number.

31402987 is a deficient number, since it is larger than the sum of its proper divisors (7880213).

31402987 is a wasteful number, since it uses less digits than its factorization.

31402987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 31402987 is about 5603.8368106147. The cubic root of 31402987 is about 315.4934300753.

The spelling of 31402987 in words is "thirty-one million, four hundred two thousand, nine hundred eighty-seven".