2987931 has 8 divisors (see below), whose sum is σ = 4068864. Its totient is φ = 1949480.

The previous prime is 2987923. The next prime is 2987947. The reversal of 2987931 is 1397892.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2987931 - 2³ = 2987923 is a prime.

It is a super-2 number, since 2×2987931² = 17855463321522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2987931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2987911) 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, 10455 + ... + 10736.

It is an arithmetic number, because the mean of its divisors is an integer number (508608).

2^2987931 is an apocalyptic number.

2987931 is a deficient number, since it is larger than the sum of its proper divisors (1080933).

2987931 is a wasteful number, since it uses less digits than its factorization.

2987931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21241.

The product of its digits is 27216, while the sum is 39.

The square root of 2987931 is about 1728.5632762500. The cubic root of 2987931 is about 144.0312914251.

Subtracting from 2987931 its sum of digits (39), we obtain a palindrome (2987892).

The spelling of 2987931 in words is "two million, nine hundred eighty-seven thousand, nine hundred thirty-one".