31490340 has 72 divisors (see below), whose sum is σ = 102578112. Its totient is φ = 7197120.

The previous prime is 31490339. The next prime is 31490351. The reversal of 31490340 is 4309413.

It is a self number, because there is not a number n which added to its sum of digits gives 31490340.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2416 + ... + 8295.

It is an arithmetic number, because the mean of its divisors is an integer number (1424696).

Almost surely, 2^31490340 is an apocalyptic number.

31490340 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31490340 is an abundant number, since it is smaller than the sum of its proper divisors (71087772).

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

31490340 is a wasteful number, since it uses less digits than its factorization.

31490340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10737 (or 10728 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 31490340 is about 5611.6254329739. The cubic root of 31490340 is about 315.7856929664.

Adding to 31490340 its reverse (4309413), we get a palindrome (35799753).

The spelling of 31490340 in words is "thirty-one million, four hundred ninety thousand, three hundred forty".