31485916 has 48 divisors (see below), whose sum is σ = 69253632. Its totient is φ = 12168000.

The previous prime is 31485893. The next prime is 31485917. The reversal of 31485916 is 61958413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31485917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46170 + ... + 46846.

It is an arithmetic number, because the mean of its divisors is an integer number (1442784).

Almost surely, 2^31485916 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31485916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34626816).

31485916 is an abundant number, since it is smaller than the sum of its proper divisors (37767716).

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

31485916 is a wasteful number, since it uses less digits than its factorization.

31485916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850 (or 848 counting only the distinct ones).

The product of its digits is 25920, while the sum is 37.

The square root of 31485916 is about 5611.2312374380. The cubic root of 31485916 is about 315.7709042902.

The spelling of 31485916 in words is "thirty-one million, four hundred eighty-five thousand, nine hundred sixteen".