1866881474 has 4 divisors (see below), whose sum is σ = 2800322214. Its totient is φ = 933440736.

The previous prime is 1866881453. The next prime is 1866881479. The reversal of 1866881474 is 4741886681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4741886681 = 7 ⋅677412383.

It can be written as a sum of positive squares in only one way, i.e., 1532174449 + 334707025 = 39143^2 + 18295^2 .

It is not an unprimeable number, because it can be changed into a prime (1866881479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 466720367 + ... + 466720370.

Almost surely, 2^1866881474 is an apocalyptic number.

1866881474 is a deficient number, since it is larger than the sum of its proper divisors (933440740).

1866881474 is an equidigital number, since it uses as much as digits as its factorization.

1866881474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933440739.

The product of its digits is 2064384, while the sum is 53.

The square root of 1866881474 is about 43207.4238297078. The cubic root of 1866881474 is about 1231.3237283480.

The spelling of 1866881474 in words is "one billion, eight hundred sixty-six million, eight hundred eighty-one thousand, four hundred seventy-four".