1936640087 has 4 divisors (see below), whose sum is σ = 1973180520. Its totient is φ = 1900099656.

The previous prime is 1936640071. The next prime is 1936640099. The reversal of 1936640087 is 7800466391.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7800466391 = 5051 ⋅1544341.

It is a cyclic number.

It is not a de Polignac number, because 1936640087 - 2⁴ = 1936640071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1936640047) 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, 18270137 + ... + 18270242.

It is an arithmetic number, because the mean of its divisors is an integer number (493295130).

Almost surely, 2^1936640087 is an apocalyptic number.

1936640087 is a deficient number, since it is larger than the sum of its proper divisors (36540433).

1936640087 is an equidigital number, since it uses as much as digits as its factorization.

1936640087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36540432.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 1936640087 is about 44007.2731147932. The cubic root of 1936640087 is about 1246.4732777016.

The spelling of 1936640087 in words is "one billion, nine hundred thirty-six million, six hundred forty thousand, eighty-seven".