1827166378 has 4 divisors (see below), whose sum is σ = 2740749570. Its totient is φ = 913583188.

The previous prime is 1827166349. The next prime is 1827166379. The reversal of 1827166378 is 8736617281.

It is a happy number.

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., 1466660209 + 360506169 = 38297^2 + 18987^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1827166379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 456791593 + ... + 456791596.

Almost surely, 2^1827166378 is an apocalyptic number.

1827166378 is a deficient number, since it is larger than the sum of its proper divisors (913583192).

1827166378 is an equidigital number, since it uses as much as digits as its factorization.

1827166378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913583191.

The product of its digits is 677376, while the sum is 49.

The square root of 1827166378 is about 42745.3667430752. The cubic root of 1827166378 is about 1222.5295491510.

The spelling of 1827166378 in words is "one billion, eight hundred twenty-seven million, one hundred sixty-six thousand, three hundred seventy-eight".