2978987 has 8 divisors (see below), whose sum is σ = 3281472. Its totient is φ = 2681800.

The previous prime is 2978977. The next prime is 2978999. The reversal of 2978987 is 7898792.

2978987 = T₄₈ + T₄₉ + ... + T₂₆₁.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2978987 - 2⁶ = 2978923 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 89 + ... + 2442.

It is an arithmetic number, because the mean of its divisors is an integer number (410184).

2^2978987 is an apocalyptic number.

2978987 is a deficient number, since it is larger than the sum of its proper divisors (302485).

2978987 is a wasteful number, since it uses less digits than its factorization.

2978987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2649.

The product of its digits is 508032, while the sum is 50.

The square root of 2978987 is about 1725.9742176522. The cubic root of 2978987 is about 143.8874345351.

The spelling of 2978987 in words is "two million, nine hundred seventy-eight thousand, nine hundred eighty-seven".