4687991 has 16 divisors (see below), whose sum is σ = 5909760. Its totient is φ = 3612480.

The previous prime is 4687979. The next prime is 4687993. The reversal of 4687991 is 1997864.

4687991 = 28² + 29² + ... + 241².

It is a cyclic number.

It is not a de Polignac number, because 4687991 - 2¹⁰ = 4686967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4687993) 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, 7955 + ... + 8523.

It is an arithmetic number, because the mean of its divisors is an integer number (369360).

Almost surely, 2^4687991 is an apocalyptic number.

4687991 is a deficient number, since it is larger than the sum of its proper divisors (1221769).

4687991 is a wasteful number, since it uses less digits than its factorization.

4687991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694.

The product of its digits is 108864, while the sum is 44.

The square root of 4687991 is about 2165.1768980848. The cubic root of 4687991 is about 167.3640807224.

The spelling of 4687991 in words is "four million, six hundred eighty-seven thousand, nine hundred ninety-one".