31293930 has 16 divisors (see below), whose sum is σ = 75105504. Its totient is φ = 8345040.

The previous prime is 31293919. The next prime is 31293937. The reversal of 31293930 is 3939213.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 1043131 = 31293930 / (3 + 1 + 2 + 9 + 3 + 9 + 3 + 0).

It is not an unprimeable number, because it can be changed into a prime (31293937) 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, 521536 + ... + 521595.

It is an arithmetic number, because the mean of its divisors is an integer number (4694094).

Almost surely, 2^31293930 is an apocalyptic number.

31293930 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31293930 is an abundant number, since it is smaller than the sum of its proper divisors (43811574).

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

31293930 is a wasteful number, since it uses less digits than its factorization.

31293930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043141.

The product of its (nonzero) digits is 4374, while the sum is 30.

The square root of 31293930 is about 5594.0977824847. The cubic root of 31293930 is about 315.1277889176.

It can be divided in two parts, 31293 and 930, that added together give a palindrome (32223).

The spelling of 31293930 in words is "thirty-one million, two hundred ninety-three thousand, nine hundred thirty".