2391616 has 14 divisors (see below), whose sum is σ = 4745990. Its totient is φ = 1195776.

The previous prime is 2391589. The next prime is 2391629. The reversal of 2391616 is 6161932.

It can be written as a sum of positive squares in only one way, i.e., 2262016 + 129600 = 1504^2 + 360^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18621 + ... + 18748.

2^2391616 is an apocalyptic number.

It is an amenable number.

2391616 is a deficient number, since it is larger than the sum of its proper divisors (2354374).

2391616 is an equidigital number, since it uses as much as digits as its factorization.

2391616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37381 (or 37371 counting only the distinct ones).

The product of its digits is 1944, while the sum is 28.

The square root of 2391616 is about 1546.4850468078. The cubic root of 2391616 is about 133.7305046264.

It can be divided in two parts, 23916 and 16, that added together give a palindrome (23932).

The spelling of 2391616 in words is "two million, three hundred ninety-one thousand, six hundred sixteen".