31498740 has 192 divisors, whose sum is σ = 120798720. Its totient is φ = 6635520.

The previous prime is 31498703. The next prime is 31498741. The reversal of 31498740 is 4789413.

It is a happy number.

It is a super-3 number, since 3×31498740³ (a number of 23 digits) contains 333 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 31498695 and 31498704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31498741) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 48820 + ... + 49460.

It is an arithmetic number, because the mean of its divisors is an integer number (629160).

Almost surely, 2^31498740 is an apocalyptic number.

31498740 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 31498740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60399360).

31498740 is an abundant number, since it is smaller than the sum of its proper divisors (89299980).

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

31498740 is a wasteful number, since it uses less digits than its factorization.

31498740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679 (or 671 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 31498740 is about 5612.3738293168. The cubic root of 31498740 is about 315.8137689203.

The spelling of 31498740 in words is "thirty-one million, four hundred ninety-eight thousand, seven hundred forty".