36985781 has 4 divisors (see below), whose sum is σ = 42269472. Its totient is φ = 31702092.

The previous prime is 36985777. The next prime is 36985783. The reversal of 36985781 is 18758963.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18758963 = 37 ⋅506999.

It is a cyclic number.

It is not a de Polignac number, because 36985781 - 2² = 36985777 is a prime.

It is a super-2 number, since 2×36985781² = 2735895992359922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36985783) 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, 2641835 + ... + 2641848.

It is an arithmetic number, because the mean of its divisors is an integer number (10567368).

Almost surely, 2^36985781 is an apocalyptic number.

It is an amenable number.

36985781 is a deficient number, since it is larger than the sum of its proper divisors (5283691).

36985781 is an equidigital number, since it uses as much as digits as its factorization.

36985781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5283690.

The product of its digits is 362880, while the sum is 47.

The square root of 36985781 is about 6081.5936233852. The cubic root of 36985781 is about 333.1794942337.

The spelling of 36985781 in words is "thirty-six million, nine hundred eighty-five thousand, seven hundred eighty-one".