2516638 has 4 divisors (see below), whose sum is σ = 3774960. Its totient is φ = 1258318.

The previous prime is 2516603. The next prime is 2516659. The reversal of 2516638 is 8366152.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 629158 + ... + 629161.

It is an arithmetic number, because the mean of its divisors is an integer number (943740).

2^2516638 is an apocalyptic number.

2516638 is a deficient number, since it is larger than the sum of its proper divisors (1258322).

2516638 is a wasteful number, since it uses less digits than its factorization.

2516638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258321.

The product of its digits is 8640, while the sum is 31.

The square root of 2516638 is about 1586.3915027508. The cubic root of 2516638 is about 136.0212985674.

It can be divided in two parts, 251 and 6638, that added together give a square (6889 = 83²).

The spelling of 2516638 in words is "two million, five hundred sixteen thousand, six hundred thirty-eight".