2979945 has 12 divisors (see below), whose sum is σ = 5165316. Its totient is φ = 1589280.

The previous prime is 2979931. The next prime is 2979967. The reversal of 2979945 is 5499792.

It can be written as a sum of positive squares in 2 ways, for example, as 1734489 + 1245456 = 1317^2 + 1116^2 .

It is not a de Polignac number, because 2979945 - 2⁷ = 2979817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 66221 = 2979945 / (2 + 9 + 7 + 9 + 9 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 2979945.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33066 + ... + 33155.

It is an arithmetic number, because the mean of its divisors is an integer number (430443).

2^2979945 is an apocalyptic number.

It is an amenable number.

2979945 is a deficient number, since it is larger than the sum of its proper divisors (2185371).

2979945 is a wasteful number, since it uses less digits than its factorization.

2979945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66232 (or 66229 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 2979945 is about 1726.2517197674. The cubic root of 2979945 is about 143.9028569353.

It can be divided in two parts, 297 and 9945, that multiplied together give a triangular number (2953665 = T₂₄₃₀).

The spelling of 2979945 in words is "two million, nine hundred seventy-nine thousand, nine hundred forty-five".