36855821 has 4 divisors (see below), whose sum is σ = 38458272. Its totient is φ = 35253372.

The previous prime is 36855817. The next prime is 36855823. The reversal of 36855821 is 12855863.

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.

It is a cyclic number.

It is not a de Polignac number, because 36855821 - 2² = 36855817 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 (36855823) 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, 801191 + ... + 801236.

It is an arithmetic number, because the mean of its divisors is an integer number (9614568).

Almost surely, 2^36855821 is an apocalyptic number.

It is an amenable number.

36855821 is a deficient number, since it is larger than the sum of its proper divisors (1602451).

36855821 is a wasteful number, since it uses less digits than its factorization.

36855821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1602450.

The product of its digits is 57600, while the sum is 38.

The square root of 36855821 is about 6070.8995214877. The cubic root of 36855821 is about 332.7887961444.

The spelling of 36855821 in words is "thirty-six million, eight hundred fifty-five thousand, eight hundred twenty-one".