2987921 has 4 divisors (see below), whose sum is σ = 3145200. Its totient is φ = 2830644.

The previous prime is 2987911. The next prime is 2987923. The reversal of 2987921 is 1297892.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2987921 - 2⁶ = 2987857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2987923) 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, 78611 + ... + 78648.

It is an arithmetic number, because the mean of its divisors is an integer number (786300).

2^2987921 is an apocalyptic number.

It is an amenable number.

2987921 is a deficient number, since it is larger than the sum of its proper divisors (157279).

2987921 is a wasteful number, since it uses less digits than its factorization.

2987921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157278.

The product of its digits is 18144, while the sum is 38.

The square root of 2987921 is about 1728.5603836719. The cubic root of 2987921 is about 144.0311307438.

The spelling of 2987921 in words is "two million, nine hundred eighty-seven thousand, nine hundred twenty-one".