2378721 has 4 divisors (see below), whose sum is σ = 3171632. Its totient is φ = 1585812.

The previous prime is 2378711. The next prime is 2378737. The reversal of 2378721 is 1278732.

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 not a de Polignac number, because 2378721 - 2¹⁵ = 2345953 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2378711) 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, 396451 + ... + 396456.

It is an arithmetic number, because the mean of its divisors is an integer number (792908).

2^2378721 is an apocalyptic number.

It is an amenable number.

2378721 is a deficient number, since it is larger than the sum of its proper divisors (792911).

2378721 is an equidigital number, since it uses as much as digits as its factorization.

2378721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792910.

The product of its digits is 4704, while the sum is 30.

The square root of 2378721 is about 1542.3102800669. The cubic root of 2378721 is about 133.4897241316.

The spelling of 2378721 in words is "two million, three hundred seventy-eight thousand, seven hundred twenty-one".