2991990 has 16 divisors (see below), whose sum is σ = 7180848. Its totient is φ = 797856.

The previous prime is 2991971. The next prime is 2992007. The reversal of 2991990 is 991992.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49837 + ... + 49896.

It is an arithmetic number, because the mean of its divisors is an integer number (448803).

2^2991990 is an apocalyptic number.

2991990 is an abundant number, since it is smaller than the sum of its proper divisors (4188858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2991990 is a wasteful number, since it uses less digits than its factorization.

2991990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99743.

The product of its (nonzero) digits is 13122, while the sum is 39.

The square root of 2991990 is about 1729.7369742247. The cubic root of 2991990 is about 144.0964824086.

The spelling of 2991990 in words is "two million, nine hundred ninety-one thousand, nine hundred ninety".