2378666 has 4 divisors (see below), whose sum is σ = 3568002. Its totient is φ = 1189332.

The previous prime is 2378653. The next prime is 2378669. The reversal of 2378666 is 6668732.

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

It can be written as a sum of positive squares in only one way, i.e., 2235025 + 143641 = 1495^2 + 379^2 .

It is a d-powerful number, because it can be written as 2²¹ + 3² + 7² + 8 + 6³ + 6⁴ + 6⁷ .

It is not an unprimeable number, because it can be changed into a prime (2378669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 594665 + ... + 594668.

2^2378666 is an apocalyptic number.

2378666 is a deficient number, since it is larger than the sum of its proper divisors (1189336).

2378666 is a wasteful number, since it uses less digits than its factorization.

2378666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189335.

The product of its digits is 72576, while the sum is 38.

The square root of 2378666 is about 1542.2924495698. The cubic root of 2378666 is about 133.4886952885.

The spelling of 2378666 in words is "two million, three hundred seventy-eight thousand, six hundred sixty-six".