31488738 has 32 divisors (see below), whose sum is σ = 67919040. Its totient is φ = 9699840.

The previous prime is 31488733. The next prime is 31488767. The reversal of 31488738 is 83788413.

It is a self number, because there is not a number n which added to its sum of digits gives 31488738.

It is not an unprimeable number, because it can be changed into a prime (31488733) 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 15 ways as a sum of consecutive naturals, for example, 1306 + ... + 8042.

It is an arithmetic number, because the mean of its divisors is an integer number (2122470).

Almost surely, 2^31488738 is an apocalyptic number.

31488738 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

31488738 is an abundant number, since it is smaller than the sum of its proper divisors (36430302).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31488738 is a wasteful number, since it uses less digits than its factorization.

31488738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6802.

The product of its digits is 129024, while the sum is 42.

The square root of 31488738 is about 5611.4826917669. The cubic root of 31488738 is about 315.7803379141.

The spelling of 31488738 in words is "thirty-one million, four hundred eighty-eight thousand, seven hundred thirty-eight".