31323432 has 64 divisors (see below), whose sum is σ = 91422720. Its totient is φ = 8756928.

The previous prime is 31323431. The next prime is 31323449. The reversal of 31323432 is 23432313.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 31323399 and 31323408.

It is not an unprimeable number, because it can be changed into a prime (31323431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5913 + ... + 9879.

It is an arithmetic number, because the mean of its divisors is an integer number (1428480).

Almost surely, 2^31323432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31323432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45711360).

31323432 is an abundant number, since it is smaller than the sum of its proper divisors (60099288).

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

31323432 is a wasteful number, since it uses less digits than its factorization.

31323432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4030 (or 4026 counting only the distinct ones).

The product of its digits is 1296, while the sum is 21.

The square root of 31323432 is about 5596.7340476389. The cubic root of 31323432 is about 315.2267855393.

Adding to 31323432 its reverse (23432313), we get a palindrome (54755745).

The spelling of 31323432 in words is "thirty-one million, three hundred twenty-three thousand, four hundred thirty-two".