31490384 has 10 divisors (see below), whose sum is σ = 61012650. Its totient is φ = 15745184.

The previous prime is 31490383. The next prime is 31490399. The reversal of 31490384 is 48309413.

It can be written as a sum of positive squares in only one way, i.e., 22657600 + 8832784 = 4760^2 + 2972^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31490384.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31490383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984059 + ... + 984090.

It is an arithmetic number, because the mean of its divisors is an integer number (6101265).

Almost surely, 2^31490384 is an apocalyptic number.

It is an amenable number.

31490384 is a deficient number, since it is larger than the sum of its proper divisors (29522266).

31490384 is a wasteful number, since it uses less digits than its factorization.

31490384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968157 (or 1968151 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 31490384 is about 5611.6293534053. The cubic root of 31490384 is about 315.7858400440.

Adding to 31490384 its reverse (48309413), we get a palindrome (79799797).

The spelling of 31490384 in words is "thirty-one million, four hundred ninety thousand, three hundred eighty-four".