31740649 has 8 divisors (see below), whose sum is σ = 33657120. Its totient is φ = 29829696.

The previous prime is 31740629. The next prime is 31740671. The reversal of 31740649 is 94604713.

It is a happy number.

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

It is not a de Polignac number, because 31740649 - 2⁵ = 31740617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31740629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20662 + ... + 22144.

It is an arithmetic number, because the mean of its divisors is an integer number (4207140).

Almost surely, 2^31740649 is an apocalyptic number.

It is an amenable number.

31740649 is a deficient number, since it is larger than the sum of its proper divisors (1916471).

31740649 is a wasteful number, since it uses less digits than its factorization.

31740649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2759.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 31740649 is about 5633.8840066157. The cubic root of 31740649 is about 316.6201868377.

The spelling of 31740649 in words is "thirty-one million, seven hundred forty thousand, six hundred forty-nine".