2621861 has 8 divisors (see below), whose sum is σ = 2959200. Its totient is φ = 2301040.

The previous prime is 2621849. The next prime is 2621863. The reversal of 2621861 is 1681262.

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

It is a cyclic number.

It is not a de Polignac number, because 2621861 - 2⁶ = 2621797 is a prime.

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 2621861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2621863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3791 + ... + 4428.

It is an arithmetic number, because the mean of its divisors is an integer number (369900).

2^2621861 is an apocalyptic number.

It is an amenable number.

2621861 is a deficient number, since it is larger than the sum of its proper divisors (337339).

2621861 is a wasteful number, since it uses less digits than its factorization.

2621861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8259.

The product of its digits is 1152, while the sum is 26.

The square root of 2621861 is about 1619.2161683975. The cubic root of 2621861 is about 137.8912010902.

The spelling of 2621861 in words is "two million, six hundred twenty-one thousand, eight hundred sixty-one".