31422540 has 48 divisors (see below), whose sum is σ = 88284672. Its totient is φ = 8350656.

The previous prime is 31422533. The next prime is 31422557. The reversal of 31422540 is 4522413.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21307 + ... + 22733.

It is an arithmetic number, because the mean of its divisors is an integer number (1839264).

Almost surely, 2^31422540 is an apocalyptic number.

31422540 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31422540 is an abundant number, since it is smaller than the sum of its proper divisors (56862132).

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

31422540 is a wasteful number, since it uses less digits than its factorization.

31422540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1806 (or 1804 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 31422540 is about 5605.5811473923. The cubic root of 31422540 is about 315.5588969170.

Adding to 31422540 its reverse (4522413), we get a palindrome (35944953).

The spelling of 31422540 in words is "thirty-one million, four hundred twenty-two thousand, five hundred forty".