31426405 has 8 divisors (see below), whose sum is σ = 38928384. Its totient is φ = 24330000.

The previous prime is 31426397. The next prime is 31426411. The reversal of 31426405 is 50462413.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31426405 - 2³ = 31426397 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 31426405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101221 + ... + 101530.

It is an arithmetic number, because the mean of its divisors is an integer number (4866048).

Almost surely, 2^31426405 is an apocalyptic number.

It is an amenable number.

31426405 is a deficient number, since it is larger than the sum of its proper divisors (7501979).

31426405 is a wasteful number, since it uses less digits than its factorization.

31426405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202787.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 31426405 is about 5605.9258824926. The cubic root of 31426405 is about 315.5718343937.

Adding to 31426405 its reverse (50462413), we get a palindrome (81888818).

The spelling of 31426405 in words is "thirty-one million, four hundred twenty-six thousand, four hundred five".