31978230 has 16 divisors (see below), whose sum is σ = 76747824. Its totient is φ = 8527520.

The previous prime is 31978223. The next prime is 31978259. The reversal of 31978230 is 3287913.

It is a junction number, because it is equal to n+sod(n) for n = 31978191 and 31978200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 532941 + ... + 533000.

It is an arithmetic number, because the mean of its divisors is an integer number (4796739).

Almost surely, 2^31978230 is an apocalyptic number.

31978230 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31978230 is an abundant number, since it is smaller than the sum of its proper divisors (44769594).

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

31978230 is a wasteful number, since it uses less digits than its factorization.

31978230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065951.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 31978230 is about 5654.9297077859. The cubic root of 31978230 is about 317.4081988092.

The spelling of 31978230 in words is "thirty-one million, nine hundred seventy-eight thousand, two hundred thirty".