31383120 has 80 divisors (see below), whose sum is σ = 99582912. Its totient is φ = 8171520.

The previous prime is 31383083. The next prime is 31383161. The reversal of 31383120 is 2138313.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8800 + ... + 11840.

Almost surely, 2^31383120 is an apocalyptic number.

31383120 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 31383120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49791456).

31383120 is an abundant number, since it is smaller than the sum of its proper divisors (68199792).

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

31383120 is a wasteful number, since it uses less digits than its factorization.

31383120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3100 (or 3094 counting only the distinct ones).

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

The square root of 31383120 is about 5602.0639053834. The cubic root of 31383120 is about 315.4268840677.

The spelling of 31383120 in words is "thirty-one million, three hundred eighty-three thousand, one hundred twenty".