31489420 has 48 divisors (see below), whose sum is σ = 68620608. Its totient is φ = 12130560.

The previous prime is 31489417. The next prime is 31489427. The reversal of 31489420 is 2498413.

It is not an unprimeable number, because it can be changed into a prime (31489427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64417 + ... + 64903.

It is an arithmetic number, because the mean of its divisors is an integer number (1429596).

Almost surely, 2^31489420 is an apocalyptic number.

It is an amenable number.

31489420 is an abundant number, since it is smaller than the sum of its proper divisors (37131188).

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

31489420 is a wasteful number, since it uses less digits than its factorization.

31489420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610 (or 608 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 31489420 is about 5611.5434596909. The cubic root of 31489420 is about 315.7826176777.

The spelling of 31489420 in words is "thirty-one million, four hundred eighty-nine thousand, four hundred twenty".