31399673 has 4 divisors (see below), whose sum is σ = 31581348. Its totient is φ = 31218000.

The previous prime is 31399661. The next prime is 31399729. The reversal of 31399673 is 37699313.

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

It can be written as a sum of positive squares in 2 ways, for example, as 30558784 + 840889 = 5528^2 + 917^2 .

It is a cyclic number.

It is not a de Polignac number, because 31399673 - 2¹⁶ = 31334137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31399673.

It is not an unprimeable number, because it can be changed into a prime (31399573) 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, 90578 + ... + 90923.

It is an arithmetic number, because the mean of its divisors is an integer number (7895337).

Almost surely, 2^31399673 is an apocalyptic number.

It is an amenable number.

31399673 is a deficient number, since it is larger than the sum of its proper divisors (181675).

31399673 is a wasteful number, since it uses less digits than its factorization.

31399673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181674.

The product of its digits is 91854, while the sum is 41.

The square root of 31399673 is about 5603.5411125466. The cubic root of 31399673 is about 315.4823315343.

The spelling of 31399673 in words is "thirty-one million, three hundred ninety-nine thousand, six hundred seventy-three".