2621939 has 4 divisors (see below), whose sum is σ = 2645256. Its totient is φ = 2598624.

The previous prime is 2621933. The next prime is 2621947. The reversal of 2621939 is 9391262.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9391262 = 2 ⋅4695631.

It is a cyclic number.

It is not a de Polignac number, because 2621939 - 2⁴ = 2621923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2621933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11489 + ... + 11714.

It is an arithmetic number, because the mean of its divisors is an integer number (661314).

2^2621939 is an apocalyptic number.

2621939 is a deficient number, since it is larger than the sum of its proper divisors (23317).

2621939 is a wasteful number, since it uses less digits than its factorization.

2621939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23316.

The product of its digits is 5832, while the sum is 32.

The square root of 2621939 is about 1619.2402539463. The cubic root of 2621939 is about 137.8925684913.

The spelling of 2621939 in words is "two million, six hundred twenty-one thousand, nine hundred thirty-nine".