31494900 has 72 divisors (see below), whose sum is σ = 91695520. Its totient is φ = 8346240.

The previous prime is 31494887. The next prime is 31494907. The reversal of 31494900 is 949413.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31494907) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82911 + ... + 83289.

Almost surely, 2^31494900 is an apocalyptic number.

31494900 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 31494900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45847760).

31494900 is an abundant number, since it is smaller than the sum of its proper divisors (60200620).

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

31494900 is a wasteful number, since it uses less digits than its factorization.

31494900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673 (or 666 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 31494900 is about 5612.0317176581. The cubic root of 31494900 is about 315.8009348179.

The spelling of 31494900 in words is "thirty-one million, four hundred ninety-four thousand, nine hundred".