31408425 has 96 divisors (see below), whose sum is σ = 63488000. Its totient is φ = 15163200.

The previous prime is 31408423. The next prime is 31408439. The reversal of 31408425 is 52480413.

It is not a de Polignac number, because 31408425 - 2¹ = 31408423 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (31408423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 397536 + ... + 397614.

Almost surely, 2^31408425 is an apocalyptic number.

It is an amenable number.

31408425 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

31408425 is a wasteful number, since it uses less digits than its factorization.

31408425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 31408425 is about 5604.3219928908. The cubic root of 31408425 is about 315.5116401715.

Adding to 31408425 its reverse (52480413), we get a palindrome (83888838).

The spelling of 31408425 in words is "thirty-one million, four hundred eight thousand, four hundred twenty-five".