31498389 has 48 divisors (see below), whose sum is σ = 51979200. Its totient is φ = 19055088.

The previous prime is 31498367. The next prime is 31498421. The reversal of 31498389 is 98389413.

It is not a de Polignac number, because 31498389 - 2¹² = 31494293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31498349) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 533842 + ... + 533900.

It is an arithmetic number, because the mean of its divisors is an integer number (1082900).

Almost surely, 2^31498389 is an apocalyptic number.

31498389 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

31498389 is a deficient number, since it is larger than the sum of its proper divisors (20480811).

31498389 is an frugal number, since it uses more digits than its factorization.

31498389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113 (or 75 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 31498389 is about 5612.3425590390. The cubic root of 31498389 is about 315.8125958464.

The spelling of 31498389 in words is "thirty-one million, four hundred ninety-eight thousand, three hundred eighty-nine".