31478396 has 12 divisors (see below), whose sum is σ = 56126952. Its totient is φ = 15442128.

The previous prime is 31478393. The next prime is 31478399. The reversal of 31478396 is 69387413.

It is an interprime number because it is at equal distance from previous prime (31478393) and next prime (31478399).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31478393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74030 + ... + 74453.

It is an arithmetic number, because the mean of its divisors is an integer number (4677246).

Almost surely, 2^31478396 is an apocalyptic number.

It is an amenable number.

31478396 is a deficient number, since it is larger than the sum of its proper divisors (24648556).

31478396 is a wasteful number, since it uses less digits than its factorization.

31478396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148540 (or 148538 counting only the distinct ones).

The product of its digits is 108864, while the sum is 41.

The square root of 31478396 is about 5610.5611127587. The cubic root of 31478396 is about 315.7457630357.

The spelling of 31478396 in words is "thirty-one million, four hundred seventy-eight thousand, three hundred ninety-six".