31742447 has 4 divisors (see below), whose sum is σ = 34628136. Its totient is φ = 28856760.

The previous prime is 31742441. The next prime is 31742449. The reversal of 31742447 is 74424713.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31742447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31742441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1442828 + ... + 1442849.

It is an arithmetic number, because the mean of its divisors is an integer number (8657034).

Almost surely, 2^31742447 is an apocalyptic number.

31742447 is a deficient number, since it is larger than the sum of its proper divisors (2885689).

31742447 is a wasteful number, since it uses less digits than its factorization.

31742447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2885688.

The product of its digits is 18816, while the sum is 32.

The square root of 31742447 is about 5634.0435745564. The cubic root of 31742447 is about 316.6261652110.

The spelling of 31742447 in words is "thirty-one million, seven hundred forty-two thousand, four hundred forty-seven".