1868740987 has 4 divisors (see below), whose sum is σ = 1888006456. Its totient is φ = 1849475520.

The previous prime is 1868740969. The next prime is 1868741023. The reversal of 1868740987 is 7890478681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7890478681 = 1327 ⋅5946103.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1868740987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1868740957) 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, 9632589 + ... + 9632782.

It is an arithmetic number, because the mean of its divisors is an integer number (472001614).

Almost surely, 2^1868740987 is an apocalyptic number.

1868740987 is a deficient number, since it is larger than the sum of its proper divisors (19265469).

1868740987 is an equidigital number, since it uses as much as digits as its factorization.

1868740987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19265468.

The product of its (nonzero) digits is 5419008, while the sum is 58.

The square root of 1868740987 is about 43228.9369173011. The cubic root of 1868740987 is about 1231.7324139419.

The spelling of 1868740987 in words is "one billion, eight hundred sixty-eight million, seven hundred forty thousand, nine hundred eighty-seven".