31240016 has 40 divisors (see below), whose sum is σ = 65602944. Its totient is φ = 14353920.

The previous prime is 31239977. The next prime is 31240019. The reversal of 31240016 is 61004213.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a junction number, because it is equal to n+sod(n) for n = 31239976 and 31240003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31240019) 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, 10361 + ... + 13031.

Almost surely, 2^31240016 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 31240016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32801472).

31240016 is an abundant number, since it is smaller than the sum of its proper divisors (34362928).

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

31240016 is a wasteful number, since it uses less digits than its factorization.

31240016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2739 (or 2733 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 31240016 is about 5589.2768763052. The cubic root of 31240016 is about 314.9467147627.

Adding to 31240016 its reverse (61004213), we get a palindrome (92244229).

The spelling of 31240016 in words is "thirty-one million, two hundred forty thousand, sixteen".