2661979 has 12 divisors (see below), whose sum is σ = 2893168. Its totient is φ = 2448000.

The previous prime is 2661961. The next prime is 2661991. The reversal of 2661979 is 9791662.

It is not a de Polignac number, because 2661979 - 2⁵ = 2661947 is a prime.

It is a super-2 number, since 2×2661979² = 14172264392882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2661929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17554 + ... + 17704.

2^2661979 is an apocalyptic number.

2661979 is a deficient number, since it is larger than the sum of its proper divisors (231189).

2661979 is a wasteful number, since it uses less digits than its factorization.

2661979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246 (or 229 counting only the distinct ones).

The product of its digits is 40824, while the sum is 40.

The square root of 2661979 is about 1631.5572316042. The cubic root of 2661979 is about 138.5909510475.

The spelling of 2661979 in words is "two million, six hundred sixty-one thousand, nine hundred seventy-nine".