31421432 has 16 divisors (see below), whose sum is σ = 67331760. Its totient is φ = 13466304.

The previous prime is 31421431. The next prime is 31421437. The reversal of 31421432 is 23412413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31421431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280493 + ... + 280604.

It is an arithmetic number, because the mean of its divisors is an integer number (4208235).

Almost surely, 2^31421432 is an apocalyptic number.

It is an amenable number.

31421432 is an abundant number, since it is smaller than the sum of its proper divisors (35910328).

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

31421432 is a wasteful number, since it uses less digits than its factorization.

31421432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561110 (or 561106 counting only the distinct ones).

The product of its digits is 576, while the sum is 20.

The square root of 31421432 is about 5605.4823164470. The cubic root of 31421432 is about 315.5551878665. Note that the first 3 decimals are identical.

Adding to 31421432 its reverse (23412413), we get a palindrome (54833845).

The spelling of 31421432 in words is "thirty-one million, four hundred twenty-one thousand, four hundred thirty-two".