2391857 has 6 divisors (see below), whose sum is σ = 2590182. Its totient is φ = 2207712.

The previous prime is 2391847. The next prime is 2391859. The reversal of 2391857 is 7581932.

It can be written as a sum of positive squares in 3 ways, for example, as 7921 + 2383936 = 89^2 + 1544^2 .

It is not a de Polignac number, because 2391857 - 2¹⁴ = 2375473 is a prime.

It is a super-4 number, since 4×2391857⁴ (a number of 27 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2391859) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6908 + ... + 7245.

It is an arithmetic number, because the mean of its divisors is an integer number (431697).

2^2391857 is an apocalyptic number.

It is an amenable number.

2391857 is a deficient number, since it is larger than the sum of its proper divisors (198325).

2391857 is a wasteful number, since it uses less digits than its factorization.

2391857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14179 (or 14166 counting only the distinct ones).

The product of its digits is 15120, while the sum is 35.

The square root of 2391857 is about 1546.5629634774. The cubic root of 2391857 is about 133.7349964246.

The spelling of 2391857 in words is "two million, three hundred ninety-one thousand, eight hundred fifty-seven".