31427643 has 16 divisors (see below), whose sum is σ = 45547040. Its totient is φ = 19160064.

The previous prime is 31427639. The next prime is 31427647. The reversal of 31427643 is 34672413.

It is an interprime number because it is at equal distance from previous prime (31427639) and next prime (31427647).

It is not a de Polignac number, because 31427643 - 2² = 31427639 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 31427643.

It is not an unprimeable number, because it can be changed into a prime (31427647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 555 + ... + 7947.

It is an arithmetic number, because the mean of its divisors is an integer number (2846690).

Almost surely, 2^31427643 is an apocalyptic number.

31427643 is a deficient number, since it is larger than the sum of its proper divisors (14119397).

31427643 is a wasteful number, since it uses less digits than its factorization.

31427643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7518.

The product of its digits is 12096, while the sum is 30.

The square root of 31427643 is about 5606.0363002749. The cubic root of 31427643 is about 315.5759781787.

The spelling of 31427643 in words is "thirty-one million, four hundred twenty-seven thousand, six hundred forty-three".