36887891 has 4 divisors (see below), whose sum is σ = 36915984. Its totient is φ = 36859800.

The previous prime is 36887887. The next prime is 36887899. The reversal of 36887891 is 19878863.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19878863 = 61 ⋅325883.

It is a cyclic number.

It is not a de Polignac number, because 36887891 - 2² = 36887887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36887899) 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, 11975 + ... + 14736.

It is an arithmetic number, because the mean of its divisors is an integer number (9228996).

Almost surely, 2^36887891 is an apocalyptic number.

36887891 is a deficient number, since it is larger than the sum of its proper divisors (28093).

36887891 is a wasteful number, since it uses less digits than its factorization.

36887891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28092.

The product of its digits is 580608, while the sum is 50.

The square root of 36887891 is about 6073.5402361391. The cubic root of 36887891 is about 332.8852932724.

Subtracting from 36887891 its reverse (19878863), we obtain a triangular number (17009028 = T₅₈₃₂).

The spelling of 36887891 in words is "thirty-six million, eight hundred eighty-seven thousand, eight hundred ninety-one".