31427406 has 32 divisors (see below), whose sum is σ = 73516800. Its totient is φ = 9924120.

The previous prime is 31427399. The next prime is 31427411. The reversal of 31427406 is 60472413.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 31427406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14290 + ... + 16341.

It is an arithmetic number, because the mean of its divisors is an integer number (2297400).

Almost surely, 2^31427406 is an apocalyptic number.

31427406 is an abundant number, since it is smaller than the sum of its proper divisors (42089394).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31427406 is a wasteful number, since it uses less digits than its factorization.

31427406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30661 (or 30655 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 31427406 is about 5606.0151623056. The cubic root of 31427406 is about 315.5751849100.

Adding to 31427406 its reverse (60472413), we get a palindrome (91899819).

The spelling of 31427406 in words is "thirty-one million, four hundred twenty-seven thousand, four hundred six".