2391869 has 4 divisors (see below), whose sum is σ = 2398560. Its totient is φ = 2385180.

The previous prime is 2391863. The next prime is 2391881. The reversal of 2391869 is 9681932.

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 a de Polignac number, because none of the positive numbers 2^k-2391869 is a prime.

It is a super-2 number, since 2×2391869² = 11442074626322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2391863) 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, 2777 + ... + 3534.

It is an arithmetic number, because the mean of its divisors is an integer number (599640).

2^2391869 is an apocalyptic number.

It is an amenable number.

2391869 is a deficient number, since it is larger than the sum of its proper divisors (6691).

2391869 is an equidigital number, since it uses as much as digits as its factorization.

2391869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6690.

The product of its digits is 23328, while the sum is 38.

The square root of 2391869 is about 1546.5668430430. The cubic root of 2391869 is about 133.7352200747.

The spelling of 2391869 in words is "two million, three hundred ninety-one thousand, eight hundred sixty-nine".