31389480 has 192 divisors, whose sum is σ = 113218560. Its totient is φ = 7501824.

The previous prime is 31389473. The next prime is 31389509. The reversal of 31389480 is 8498313.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 140649 + ... + 140871.

It is an arithmetic number, because the mean of its divisors is an integer number (589680).

Almost surely, 2^31389480 is an apocalyptic number.

31389480 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 31389480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56609280).

31389480 is an abundant number, since it is smaller than the sum of its proper divisors (81829080).

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

31389480 is a wasteful number, since it uses less digits than its factorization.

31389480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 273 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 31389480 is about 5602.6315245606. The cubic root of 31389480 is about 315.4481904205.

The spelling of 31389480 in words is "thirty-one million, three hundred eighty-nine thousand, four hundred eighty".