43836021 has 24 divisors (see below), whose sum is σ = 66924000. Its totient is φ = 27572832.

The previous prime is 43835993. The next prime is 43836031. The reversal of 43836021 is 12063834.

It is a happy number.

It is not a de Polignac number, because 43836021 - 2⁹ = 43835509 is a prime.

It is a super-2 number, since 2×43836021² = 3843193474224882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43836031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66190 + ... + 66848.

It is an arithmetic number, because the mean of its divisors is an integer number (2788500).

Almost surely, 2^43836021 is an apocalyptic number.

It is an amenable number.

43836021 is a deficient number, since it is larger than the sum of its proper divisors (23087979).

43836021 is a wasteful number, since it uses less digits than its factorization.

43836021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073 (or 1070 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 43836021 is about 6620.8776608543. The cubic root of 43836021 is about 352.5957247195.

Adding to 43836021 its reverse (12063834), we get a palindrome (55899855).

It can be divided in two parts, 4383 and 6021, that added together give a square (10404 = 102²).

The spelling of 43836021 in words is "forty-three million, eight hundred thirty-six thousand, twenty-one".