31497428 has 12 divisors (see below), whose sum is σ = 55410432. Its totient is φ = 15665880.

The previous prime is 31497409. The next prime is 31497443. The reversal of 31497428 is 82479413.

It is a junction number, because it is equal to n+sod(n) for n = 31497391 and 31497400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19850 + ... + 21377.

It is an arithmetic number, because the mean of its divisors is an integer number (4617536).

Almost surely, 2^31497428 is an apocalyptic number.

It is an amenable number.

31497428 is a deficient number, since it is larger than the sum of its proper divisors (23913004).

31497428 is a wasteful number, since it uses less digits than its factorization.

31497428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41422 (or 41420 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 31497428 is about 5612.2569435121. The cubic root of 31497428 is about 315.8093840526.

The spelling of 31497428 in words is "thirty-one million, four hundred ninety-seven thousand, four hundred twenty-eight".