36381987 has 8 divisors (see below), whose sum is σ = 53899280. Its totient is φ = 24254640.

The previous prime is 36381907. The next prime is 36381991. The reversal of 36381987 is 78918363.

It is a happy number.

36381987 is a `hidden beast` number, since 3 + 638 + 1 + 9 + 8 + 7 = 666.

It is not a de Polignac number, because 36381987 - 2⁷ = 36381859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36381907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 673714 + ... + 673767.

It is an arithmetic number, because the mean of its divisors is an integer number (6737410).

Almost surely, 2^36381987 is an apocalyptic number.

36381987 is a deficient number, since it is larger than the sum of its proper divisors (17517293).

36381987 is a wasteful number, since it uses less digits than its factorization.

36381987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347490 (or 1347484 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 36381987 is about 6031.7482540305. The cubic root of 36381987 is about 331.3564825818.

It can be divided in two parts, 3638 and 1987, that added together give a square (5625 = 75²).

The spelling of 36381987 in words is "thirty-six million, three hundred eighty-one thousand, nine hundred eighty-seven".