2991904 has 12 divisors (see below), whose sum is σ = 5890374. Its totient is φ = 1495936.

The previous prime is 2991899. The next prime is 2991907. The reversal of 2991904 is 4091992.

It can be written as a sum of positive squares in only one way, i.e., 2108304 + 883600 = 1452^2 + 940^2 .

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2991904.

It is not an unprimeable number, because it can be changed into a prime (2991907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 46717 + ... + 46780.

2^2991904 is an apocalyptic number.

It is an amenable number.

2991904 is a deficient number, since it is larger than the sum of its proper divisors (2898470).

2991904 is an equidigital number, since it uses as much as digits as its factorization.

2991904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93507 (or 93499 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 2991904 is about 1729.7121147752. The cubic root of 2991904 is about 144.0951017872.

The spelling of 2991904 in words is "two million, nine hundred ninety-one thousand, nine hundred four".