2979869 has 4 divisors (see below), whose sum is σ = 3060444. Its totient is φ = 2899296.

The previous prime is 2979863. The next prime is 2979877. The reversal of 2979869 is 9689792.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2067844 + 912025 = 1438^2 + 955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2979869 is a prime.

It is a super-2 number, since 2×2979869² = 17759238514322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2979863) 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, 40232 + ... + 40305.

It is an arithmetic number, because the mean of its divisors is an integer number (765111).

2^2979869 is an apocalyptic number.

It is an amenable number.

2979869 is a deficient number, since it is larger than the sum of its proper divisors (80575).

2979869 is an equidigital number, since it uses as much as digits as its factorization.

2979869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80574.

The product of its digits is 489888, while the sum is 50.

The square root of 2979869 is about 1726.2297066150. The cubic root of 2979869 is about 143.9016335671.

The spelling of 2979869 in words is "two million, nine hundred seventy-nine thousand, eight hundred sixty-nine".