31406369 has 16 divisors (see below), whose sum is σ = 33339600. Its totient is φ = 29552640.

The previous prime is 31406363. The next prime is 31406381. The reversal of 31406369 is 96360413.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 5017600 + 26388769 = 2240^2 + 5137^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31406369 is a prime.

It is a super-2 number, since 2×31406369² = 1972720027528322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31406363) 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, 210707 + ... + 210855.

It is an arithmetic number, because the mean of its divisors is an integer number (2083725).

Almost surely, 2^31406369 is an apocalyptic number.

It is an amenable number.

31406369 is a deficient number, since it is larger than the sum of its proper divisors (1933231).

31406369 is a wasteful number, since it uses less digits than its factorization.

31406369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 31406369 is about 5604.1385600287. The cubic root of 31406369 is about 315.5047555423.

The spelling of 31406369 in words is "thirty-one million, four hundred six thousand, three hundred sixty-nine".