31293030 has 32 divisors (see below), whose sum is σ = 77695200. Its totient is φ = 8056832.

The previous prime is 31293029. The next prime is 31293047. The reversal of 31293030 is 3039213.

It is a junction number, because it is equal to n+sod(n) for n = 31292988 and 31293006.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17115 + ... + 18854.

It is an arithmetic number, because the mean of its divisors is an integer number (2427975).

Almost surely, 2^31293030 is an apocalyptic number.

31293030 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31293030 is an abundant number, since it is smaller than the sum of its proper divisors (46402170).

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

31293030 is a wasteful number, since it uses less digits than its factorization.

31293030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36008.

The product of its (nonzero) digits is 486, while the sum is 21.

The square root of 31293030 is about 5594.0173399803. The cubic root of 31293030 is about 315.1247679087.

The spelling of 31293030 in words is "thirty-one million, two hundred ninety-three thousand, thirty".