31029420 has 96 divisors (see below), whose sum is σ = 95256000. Its totient is φ = 7512064.

The previous prime is 31029389. The next prime is 31029431. The reversal of 31029420 is 2492013.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29056 + ... + 30104.

It is an arithmetic number, because the mean of its divisors is an integer number (992250).

Almost surely, 2^31029420 is an apocalyptic number.

31029420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31029420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47628000).

31029420 is an abundant number, since it is smaller than the sum of its proper divisors (64226580).

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

31029420 is a wasteful number, since it uses less digits than its factorization.

31029420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107 (or 1105 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 31029420 is about 5570.4057302857. The cubic root of 31029420 is about 314.2374095379.

The spelling of 31029420 in words is "thirty-one million, twenty-nine thousand, four hundred twenty".