2391849 has 28 divisors (see below), whose sum is σ = 3816756. Its totient is φ = 1492992.

The previous prime is 2391847. The next prime is 2391859. The reversal of 2391849 is 9481932.

It can be written as a sum of positive squares in 2 ways, for example, as 1225449 + 1166400 = 1107^2 + 1080^2 .

It is not a de Polignac number, because 2391849 - 2¹ = 2391847 is a prime.

It is a Curzon number.

2391849 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2391847) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 12297 + ... + 12489.

2^2391849 is an apocalyptic number.

It is an amenable number.

2391849 is a deficient number, since it is larger than the sum of its proper divisors (1424907).

2391849 is an equidigital number, since it uses as much as digits as its factorization.

2391849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228 (or 213 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 2391849 is about 1546.5603770949. The cubic root of 2391849 is about 133.7348473241.

It can be divided in two parts, 2391 and 849, that added together give a triangular number (3240 = T₈₀).

The spelling of 2391849 in words is "two million, three hundred ninety-one thousand, eight hundred forty-nine".