2391487 has 4 divisors (see below), whose sum is σ = 2733136. Its totient is φ = 2049840.

The previous prime is 2391469. The next prime is 2391491. The reversal of 2391487 is 7841932.

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-2391487 is a prime.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2391437) 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, 170814 + ... + 170827.

It is an arithmetic number, because the mean of its divisors is an integer number (683284).

2^2391487 is an apocalyptic number.

2391487 is a deficient number, since it is larger than the sum of its proper divisors (341649).

2391487 is an equidigital number, since it uses as much as digits as its factorization.

2391487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341648.

The product of its digits is 12096, while the sum is 34.

The square root of 2391487 is about 1546.4433387616. The cubic root of 2391487 is about 133.7281001789.

The spelling of 2391487 in words is "two million, three hundred ninety-one thousand, four hundred eighty-seven".