36918421 has 8 divisors (see below), whose sum is σ = 38305080. Its totient is φ = 35539392.

The previous prime is 36918419. The next prime is 36918433. The reversal of 36918421 is 12481963.

It can be written as a sum of positive squares in 4 ways, for example, as 15295921 + 21622500 = 3911^2 + 4650^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 36918421 - 2¹ = 36918419 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 (36918451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9111 + ... + 12523.

It is an arithmetic number, because the mean of its divisors is an integer number (4788135).

Almost surely, 2^36918421 is an apocalyptic number.

It is an amenable number.

36918421 is a deficient number, since it is larger than the sum of its proper divisors (1386659).

36918421 is a wasteful number, since it uses less digits than its factorization.

36918421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3815.

The product of its digits is 10368, while the sum is 34.

The square root of 36918421 is about 6076.0530774509. The cubic root of 36918421 is about 332.9771046612.

The spelling of 36918421 in words is "thirty-six million, nine hundred eighteen thousand, four hundred twenty-one".