31742381 has 8 divisors (see below), whose sum is σ = 34972128. Its totient is φ = 28570000.

The previous prime is 31742363. The next prime is 31742393. The reversal of 31742381 is 18324713.

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

It is a cyclic number.

It is not a de Polignac number, because 31742381 - 2⁶ = 31742317 is a prime.

It is a super-2 number, since 2×31742381² = 2015157503098322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31742311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13175 + ... + 15396.

It is an arithmetic number, because the mean of its divisors is an integer number (4371516).

Almost surely, 2^31742381 is an apocalyptic number.

It is an amenable number.

31742381 is a deficient number, since it is larger than the sum of its proper divisors (3229747).

31742381 is a wasteful number, since it uses less digits than its factorization.

31742381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28683.

The product of its digits is 4032, while the sum is 29.

The square root of 31742381 is about 5634.0377173036. The cubic root of 31742381 is about 316.6259457641.

It can be divided in two parts, 31742 and 381, that added together give a palindrome (32123).

The spelling of 31742381 in words is "thirty-one million, seven hundred forty-two thousand, three hundred eighty-one".