2378391 has 4 divisors (see below), whose sum is σ = 3171192. Its totient is φ = 1585592.

The previous prime is 2378371. The next prime is 2378399. The reversal of 2378391 is 1938732.

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

It is a cyclic number.

It is not a de Polignac number, because 2378391 - 2⁵ = 2378359 is a prime.

It is a D-number.

2378391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2378399) 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, 396396 + ... + 396401.

It is an arithmetic number, because the mean of its divisors is an integer number (792798).

2^2378391 is an apocalyptic number.

2378391 is a deficient number, since it is larger than the sum of its proper divisors (792801).

2378391 is an equidigital number, since it uses as much as digits as its factorization.

2378391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792800.

The product of its digits is 9072, while the sum is 33.

The square root of 2378391 is about 1542.2032939921. The cubic root of 2378391 is about 133.4835508356.

The spelling of 2378391 in words is "two million, three hundred seventy-eight thousand, three hundred ninety-one".