2391663 has 8 divisors (see below), whose sum is σ = 3356800. Its totient is φ = 1510488.

The previous prime is 2391637. The next prime is 2391671. The reversal of 2391663 is 3661932.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-2391663 is a prime.

It is an Ulam number.

It is the 1547-th Hogben number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2391663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2391863) by changing a digit.

It is a nontrivial repunit in base 1546.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20923 + ... + 21036.

It is an arithmetic number, because the mean of its divisors is an integer number (419600).

2^2391663 is an apocalyptic number.

2391663 is a deficient number, since it is larger than the sum of its proper divisors (965137).

2391663 is a wasteful number, since it uses less digits than its factorization.

2391663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41981.

The product of its digits is 5832, while the sum is 30.

The square root of 2391663 is about 1546.5002424830. The cubic root of 2391663 is about 133.7313806439.

The spelling of 2391663 in words is "two million, three hundred ninety-one thousand, six hundred sixty-three".