31748139 has 8 divisors (see below), whose sum is σ = 47034320. Its totient is φ = 21165408.

The previous prime is 31748137. The next prime is 31748153. The reversal of 31748139 is 93184713.

It is a happy number.

It is not a de Polignac number, because 31748139 - 2¹ = 31748137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31748131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 587902 + ... + 587955.

It is an arithmetic number, because the mean of its divisors is an integer number (5879290).

Almost surely, 2^31748139 is an apocalyptic number.

31748139 is a deficient number, since it is larger than the sum of its proper divisors (15286181).

31748139 is a wasteful number, since it uses less digits than its factorization.

31748139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175866 (or 1175860 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 31748139 is about 5634.5486953260. The cubic root of 31748139 is about 316.6450896963.

The spelling of 31748139 in words is "thirty-one million, seven hundred forty-eight thousand, one hundred thirty-nine".