31392147 has 8 divisors (see below), whose sum is σ = 42069456. Its totient is φ = 20821472.

The previous prime is 31392143. The next prime is 31392157. The reversal of 31392147 is 74129313.

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

It is a cyclic number.

It is not a de Polignac number, because 31392147 - 2² = 31392143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31392143) 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, 25968 + ... + 27149.

It is an arithmetic number, because the mean of its divisors is an integer number (5258682).

Almost surely, 2^31392147 is an apocalyptic number.

31392147 is a deficient number, since it is larger than the sum of its proper divisors (10677309).

31392147 is a wasteful number, since it uses less digits than its factorization.

31392147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53317.

The product of its digits is 4536, while the sum is 30.

The square root of 31392147 is about 5602.8695326591. The cubic root of 31392147 is about 315.4571241620.

The spelling of 31392147 in words is "thirty-one million, three hundred ninety-two thousand, one hundred forty-seven".