31402693 has 4 divisors (see below), whose sum is σ = 35888800. Its totient is φ = 26916588.

The previous prime is 31402663. The next prime is 31402703. The reversal of 31402693 is 39620413.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39620413 = 7 ⋅5660059.

It is a cyclic number.

It is not a de Polignac number, because 31402693 - 2²¹ = 29305541 is a prime.

It is a super-2 number, since 2×31402693² = 1972258255304498, 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 (31402633) 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, 2243043 + ... + 2243056.

It is an arithmetic number, because the mean of its divisors is an integer number (8972200).

Almost surely, 2^31402693 is an apocalyptic number.

It is an amenable number.

31402693 is a deficient number, since it is larger than the sum of its proper divisors (4486107).

31402693 is an equidigital number, since it uses as much as digits as its factorization.

31402693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4486106.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 31402693 is about 5603.8105785260. The cubic root of 31402693 is about 315.4924455048.

The spelling of 31402693 in words is "thirty-one million, four hundred two thousand, six hundred ninety-three".