31379927 has 4 divisors (see below), whose sum is σ = 31395936. Its totient is φ = 31363920.

The previous prime is 31379923. The next prime is 31379939. The reversal of 31379927 is 72997313.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31379927 - 2² = 31379923 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31379923) 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 3 ways as a sum of consecutive naturals, for example, 4574 + ... + 9147.

It is an arithmetic number, because the mean of its divisors is an integer number (7848984).

Almost surely, 2^31379927 is an apocalyptic number.

31379927 is the 4574-th pentagonal number.

31379927 is a deficient number, since it is larger than the sum of its proper divisors (16009).

31379927 is a wasteful number, since it uses less digits than its factorization.

31379927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16008.

The product of its digits is 71442, while the sum is 41.

The square root of 31379927 is about 5601.7789138808. The cubic root of 31379927 is about 315.4161862552.

The spelling of 31379927 in words is "thirty-one million, three hundred seventy-nine thousand, nine hundred twenty-seven".