31742397 has 6 divisors (see below), whose sum is σ = 45850142. Its totient is φ = 21161592.

The previous prime is 31742393. The next prime is 31742401. The reversal of 31742397 is 79324713.

It is an interprime number because it is at equal distance from previous prime (31742393) and next prime (31742401).

It can be written as a sum of positive squares in only one way, i.e., 31741956 + 441 = 5634^2 + 21^2 .

It is not a de Polignac number, because 31742397 - 2² = 31742393 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 (31742393) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1763458 + ... + 1763475.

Almost surely, 2^31742397 is an apocalyptic number.

It is an amenable number.

31742397 is a deficient number, since it is larger than the sum of its proper divisors (14107745).

31742397 is a wasteful number, since it uses less digits than its factorization.

31742397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3526939 (or 3526936 counting only the distinct ones).

The product of its digits is 31752, while the sum is 36.

The square root of 31742397 is about 5634.0391372443. The cubic root of 31742397 is about 316.6259989634.

It can be divided in two parts, 3 and 1742397, that added together give a square (1742400 = 1320²).

The spelling of 31742397 in words is "thirty-one million, seven hundred forty-two thousand, three hundred ninety-seven".