1878022378 has 4 divisors (see below), whose sum is σ = 2817033570. Its totient is φ = 939011188.

The previous prime is 1878022361. The next prime is 1878022379. The reversal of 1878022378 is 8732208781.

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., 1368482049 + 509540329 = 36993^2 + 22573^2 .

It is not an unprimeable number, because it can be changed into a prime (1878022379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 469505593 + ... + 469505596.

Almost surely, 2^1878022378 is an apocalyptic number.

1878022378 is a deficient number, since it is larger than the sum of its proper divisors (939011192).

1878022378 is an equidigital number, since it uses as much as digits as its factorization.

1878022378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939011191.

The product of its (nonzero) digits is 301056, while the sum is 46.

The square root of 1878022378 is about 43336.1555516869. The cubic root of 1878022378 is about 1233.7682437139.

The spelling of 1878022378 in words is "one billion, eight hundred seventy-eight million, twenty-two thousand, three hundred seventy-eight".