31745389 has 8 divisors (see below), whose sum is σ = 34290200. Its totient is φ = 29215296.

The previous prime is 31745387. The next prime is 31745393. The reversal of 31745389 is 98354713.

It can be written as a sum of positive squares in 4 ways, for example, as 1605289 + 30140100 = 1267^2 + 5490^2 .

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 31745389 - 2¹ = 31745387 is a prime.

It is a super-2 number, since 2×31745389² = 2015539445522642, 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 (31745381) 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, 1039 + ... + 8035.

It is an arithmetic number, because the mean of its divisors is an integer number (4286275).

Almost surely, 2^31745389 is an apocalyptic number.

It is an amenable number.

31745389 is a deficient number, since it is larger than the sum of its proper divisors (2544811).

31745389 is a wasteful number, since it uses less digits than its factorization.

31745389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7359.

The product of its digits is 90720, while the sum is 40.

The square root of 31745389 is about 5634.3046598493. The cubic root of 31745389 is about 316.6359469123.

The spelling of 31745389 in words is "thirty-one million, seven hundred forty-five thousand, three hundred eighty-nine".