2407991 has 4 divisors (see below), whose sum is σ = 2412984. Its totient is φ = 2403000.

The previous prime is 2407963. The next prime is 2408009. The reversal of 2407991 is 1997042.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2407991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2407891) 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 3 ways as a sum of consecutive naturals, for example, 1685 + ... + 2766.

It is an arithmetic number, because the mean of its divisors is an integer number (603246).

2^2407991 is an apocalyptic number.

2407991 is a deficient number, since it is larger than the sum of its proper divisors (4993).

2407991 is an equidigital number, since it uses as much as digits as its factorization.

2407991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4992.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 2407991 is about 1551.7702793906. The cubic root of 2407991 is about 134.0350209200.

The spelling of 2407991 in words is "two million, four hundred seven thousand, nine hundred ninety-one".