2978907 has 16 divisors (see below), whose sum is σ = 4173312. Its totient is φ = 1887840.

The previous prime is 2978869. The next prime is 2978917. The reversal of 2978907 is 7098792.

It is not a de Polignac number, because 2978907 - 2¹⁰ = 2977883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2978917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4932 + ... + 5502.

It is an arithmetic number, because the mean of its divisors is an integer number (260832).

2^2978907 is an apocalyptic number.

2978907 is a deficient number, since it is larger than the sum of its proper divisors (1194405).

2978907 is a wasteful number, since it uses less digits than its factorization.

2978907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658.

The product of its (nonzero) digits is 63504, while the sum is 42.

The square root of 2978907 is about 1725.9510421794. The cubic root of 2978907 is about 143.8861465025.

Subtracting 2978907 from its reverse (7098792), we obtain a triangular number (4119885 = T₂₈₇₀).

The spelling of 2978907 in words is "two million, nine hundred seventy-eight thousand, nine hundred seven".