31409424 has 40 divisors (see below), whose sum is σ = 90157920. Its totient is φ = 10469664.

The previous prime is 31409423. The next prime is 31409429. The reversal of 31409424 is 42490413.

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 (31409423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35922 + ... + 36785.

It is an arithmetic number, because the mean of its divisors is an integer number (2253948).

Almost surely, 2^31409424 is an apocalyptic number.

It is an amenable number.

31409424 is an abundant number, since it is smaller than the sum of its proper divisors (58748496).

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

31409424 is a wasteful number, since it uses less digits than its factorization.

31409424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72724 (or 72712 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 31409424 is about 5604.4111198234. The cubic root of 31409424 is about 315.5149852696.

Adding to 31409424 its reverse (42490413), we get a palindrome (73899837).

The spelling of 31409424 in words is "thirty-one million, four hundred nine thousand, four hundred twenty-four".