31730742 has 24 divisors (see below), whose sum is σ = 69217200. Its totient is φ = 10505040.

The previous prime is 31730717. The next prime is 31730753. The reversal of 31730742 is 24703713.

31730742 is a `hidden beast` number, since 317 + 307 + 42 = 666.

It is a super-3 number, since 3×31730742³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3234 + ... + 8597.

It is an arithmetic number, because the mean of its divisors is an integer number (2884050).

Almost surely, 2^31730742 is an apocalyptic number.

31730742 is an abundant number, since it is smaller than the sum of its proper divisors (37486458).

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

31730742 is a wasteful number, since it uses less digits than its factorization.

31730742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11988 (or 11985 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 31730742 is about 5633.0047044184. The cubic root of 31730742 is about 316.5872418844.

The spelling of 31730742 in words is "thirty-one million, seven hundred thirty thousand, seven hundred forty-two".