31240406 has 8 divisors (see below), whose sum is σ = 47043720. Its totient is φ = 15559168.

The previous prime is 31240399. The next prime is 31240439. The reversal of 31240406 is 60404213.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29876 + ... + 30903.

It is an arithmetic number, because the mean of its divisors is an integer number (5880465).

Almost surely, 2^31240406 is an apocalyptic number.

31240406 is a deficient number, since it is larger than the sum of its proper divisors (15803314).

31240406 is a wasteful number, since it uses less digits than its factorization.

31240406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61038.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 31240406 is about 5589.3117644304. The cubic root of 31240406 is about 314.9480253543.

Adding to 31240406 its reverse (60404213), we get a palindrome (91644619).

The spelling of 31240406 in words is "thirty-one million, two hundred forty thousand, four hundred six".