31404685 has 16 divisors (see below), whose sum is σ = 40720176. Its totient is φ = 23113728.

The previous prime is 31404631. The next prime is 31404689. The reversal of 31404685 is 58640413.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2125764 + 29278921 = 1458^2 + 5411^2 .

It is a cyclic number.

It is not a de Polignac number, because 31404685 - 2¹⁵ = 31371917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31404689) 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, 25197 + ... + 26413.

It is an arithmetic number, because the mean of its divisors is an integer number (2545011).

Almost surely, 2^31404685 is an apocalyptic number.

It is an amenable number.

31404685 is a deficient number, since it is larger than the sum of its proper divisors (9315491).

31404685 is a wasteful number, since it uses less digits than its factorization.

31404685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 31404685 is about 5603.9883119079. The cubic root of 31404685 is about 315.4991163516.

The spelling of 31404685 in words is "thirty-one million, four hundred four thousand, six hundred eighty-five".