31404425 has 18 divisors (see below), whose sum is σ = 42173082. Its totient is φ = 23187840.

The previous prime is 31404403. The next prime is 31404427. The reversal of 31404425 is 52440413.

It can be written as a sum of positive squares in 9 ways, for example, as 27164944 + 4239481 = 5212^2 + 2059^2 .

It is not a de Polignac number, because 31404425 - 2¹⁴ = 31388041 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31404425.

It is not an unprimeable number, because it can be changed into a prime (31404427) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 509 + ... + 7941.

It is an arithmetic number, because the mean of its divisors is an integer number (2342949).

Almost surely, 2^31404425 is an apocalyptic number.

It is an amenable number.

31404425 is a deficient number, since it is larger than the sum of its proper divisors (10768657).

31404425 is a wasteful number, since it uses less digits than its factorization.

31404425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7469 (or 7451 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 31404425 is about 5603.9651140956. The cubic root of 31404425 is about 315.4982456748.

Adding to 31404425 its reverse (52440413), we get a palindrome (83844838).

The spelling of 31404425 in words is "thirty-one million, four hundred four thousand, four hundred twenty-five".