31426747 has 4 divisors (see below), whose sum is σ = 34283736. Its totient is φ = 28569760.

The previous prime is 31426729. The next prime is 31426751. The reversal of 31426747 is 74762413.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31426747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31426757) 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, 1428478 + ... + 1428499.

It is an arithmetic number, because the mean of its divisors is an integer number (8570934).

Almost surely, 2^31426747 is an apocalyptic number.

31426747 is a deficient number, since it is larger than the sum of its proper divisors (2856989).

31426747 is a wasteful number, since it uses less digits than its factorization.

31426747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2856988.

The product of its digits is 28224, while the sum is 34.

The square root of 31426747 is about 5605.9563858453. The cubic root of 31426747 is about 315.5729791336.

It can be divided in two parts, 3142 and 6747, that added together give a palindrome (9889).

The spelling of 31426747 in words is "thirty-one million, four hundred twenty-six thousand, seven hundred forty-seven".