31400979 has 8 divisors (see below), whose sum is σ = 41902080. Its totient is φ = 20916936.

The previous prime is 31400959. The next prime is 31400983. The reversal of 31400979 is 97900413.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31400979 - 2⁵ = 31400947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31400959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 942 + ... + 7980.

It is an arithmetic number, because the mean of its divisors is an integer number (5237760).

Almost surely, 2^31400979 is an apocalyptic number.

31400979 is a deficient number, since it is larger than the sum of its proper divisors (10501101).

31400979 is a wasteful number, since it uses less digits than its factorization.

31400979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8529.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 31400979 is about 5603.6576447888. The cubic root of 31400979 is about 315.4867054038.

The spelling of 31400979 in words is "thirty-one million, four hundred thousand, nine hundred seventy-nine".