31423740 has 24 divisors (see below), whose sum is σ = 87986640. Its totient is φ = 8379648.

The previous prime is 31423729. The next prime is 31423747. The reversal of 31423740 is 4732413.

It is a self number, because there is not a number n which added to its sum of digits gives 31423740.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31423747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261805 + ... + 261924.

It is an arithmetic number, because the mean of its divisors is an integer number (3666110).

Almost surely, 2^31423740 is an apocalyptic number.

31423740 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31423740 is an abundant number, since it is smaller than the sum of its proper divisors (56562900).

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

31423740 is a wasteful number, since it uses less digits than its factorization.

31423740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523741 (or 523739 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 31423740 is about 5605.6881825517. The cubic root of 31423740 is about 315.5629138409.

The spelling of 31423740 in words is "thirty-one million, four hundred twenty-three thousand, seven hundred forty".