2978521 has 16 divisors (see below), whose sum is σ = 3725568. Its totient is φ = 2318400.

The previous prime is 2978501. The next prime is 2978533. The reversal of 2978521 is 1258792.

2978521 = 134² + 135² + ... + 224².

It is not a de Polignac number, because 2978521 - 2⁵ = 2978489 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2978501) 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, 6231 + ... + 6691.

It is an arithmetic number, because the mean of its divisors is an integer number (232848).

2^2978521 is an apocalyptic number.

It is an amenable number.

2978521 is a deficient number, since it is larger than the sum of its proper divisors (747047).

2978521 is a wasteful number, since it uses less digits than its factorization.

2978521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552.

The product of its digits is 10080, while the sum is 34.

The square root of 2978521 is about 1725.8392161496. The cubic root of 2978521 is about 143.8799314207.

The spelling of 2978521 in words is "two million, nine hundred seventy-eight thousand, five hundred twenty-one".