31309742 has 8 divisors (see below), whose sum is σ = 47224632. Its totient is φ = 15568200.

The previous prime is 31309741. The next prime is 31309753. The reversal of 31309742 is 24790313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31309741) 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 3 ways as a sum of consecutive naturals, for example, 42884 + ... + 43607.

It is an arithmetic number, because the mean of its divisors is an integer number (5903079).

Almost surely, 2^31309742 is an apocalyptic number.

31309742 is a deficient number, since it is larger than the sum of its proper divisors (15914890).

31309742 is a wasteful number, since it uses less digits than its factorization.

31309742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86674.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 31309742 is about 5595.5108792674. The cubic root of 31309742 is about 315.1808552429.

The spelling of 31309742 in words is "thirty-one million, three hundred nine thousand, seven hundred forty-two".