31979142 has 48 divisors (see below), whose sum is σ = 79017120. Its totient is φ = 9259776.

The previous prime is 31979119. The next prime is 31979161. The reversal of 31979142 is 24197913.

It is a junction number, because it is equal to n+sod(n) for n = 31979097 and 31979106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42 + ... + 7997.

It is an arithmetic number, because the mean of its divisors is an integer number (1646190).

Almost surely, 2^31979142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31979142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39508560).

31979142 is an abundant number, since it is smaller than the sum of its proper divisors (47037978).

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

31979142 is a wasteful number, since it uses less digits than its factorization.

31979142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8077 (or 8074 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 31979142 is about 5655.0103448181. The cubic root of 31979142 is about 317.4112162112.

The spelling of 31979142 in words is "thirty-one million, nine hundred seventy-nine thousand, one hundred forty-two".