31425144 has 32 divisors (see below), whose sum is σ = 79739520. Its totient is φ = 10318176.

The previous prime is 31425133. The next prime is 31425179. The reversal of 31425144 is 44152413.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8164 + ... + 11379.

It is an arithmetic number, because the mean of its divisors is an integer number (2491860).

Almost surely, 2^31425144 is an apocalyptic number.

It is an amenable number.

31425144 is an abundant number, since it is smaller than the sum of its proper divisors (48314376).

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

31425144 is a wasteful number, since it uses less digits than its factorization.

31425144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19619 (or 19615 counting only the distinct ones).

The product of its digits is 1920, while the sum is 24.

The square root of 31425144 is about 5605.8134110939. The cubic root of 31425144 is about 315.5676135121.

Adding to 31425144 its reverse (44152413), we get a palindrome (75577557).

The spelling of 31425144 in words is "thirty-one million, four hundred twenty-five thousand, one hundred forty-four".