31487397 has 8 divisors (see below), whose sum is σ = 42169056. Its totient is φ = 20898672.

The previous prime is 31487381. The next prime is 31487411. The reversal of 31487397 is 79378413.

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

It is not a de Polignac number, because 31487397 - 2⁴ = 31487381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31487317) 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, 22438 + ... + 23799.

It is an arithmetic number, because the mean of its divisors is an integer number (5271132).

Almost surely, 2^31487397 is an apocalyptic number.

It is an amenable number.

31487397 is a deficient number, since it is larger than the sum of its proper divisors (10681659).

31487397 is a wasteful number, since it uses less digits than its factorization.

31487397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46467.

The product of its digits is 127008, while the sum is 42.

The square root of 31487397 is about 5611.3632033580. The cubic root of 31487397 is about 315.7758551744.

The spelling of 31487397 in words is "thirty-one million, four hundred eighty-seven thousand, three hundred ninety-seven".