31894393 has 8 divisors (see below), whose sum is σ = 32711688. Its totient is φ = 31085184.

The previous prime is 31894391. The next prime is 31894409. The reversal of 31894393 is 39349813.

It can be written as a sum of positive squares in 4 ways, for example, as 1951609 + 29942784 = 1397^2 + 5472^2 .

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 31894393 - 2¹ = 31894391 is a prime.

It is a super-3 number, since 3×31894393³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31894391) 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, 6405 + ... + 10237.

It is an arithmetic number, because the mean of its divisors is an integer number (4088961).

Almost surely, 2^31894393 is an apocalyptic number.

It is an amenable number.

31894393 is a deficient number, since it is larger than the sum of its proper divisors (817295).

31894393 is a wasteful number, since it uses less digits than its factorization.

31894393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4043.

The product of its digits is 69984, while the sum is 40.

The square root of 31894393 is about 5647.5121071141. The cubic root of 31894393 is about 317.1305741047.

The spelling of 31894393 in words is "thirty-one million, eight hundred ninety-four thousand, three hundred ninety-three".