37806221 has 8 divisors (see below), whose sum is σ = 38359800. Its totient is φ = 37255680.

The previous prime is 37806211. The next prime is 37806247. The reversal of 37806221 is 12260873.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1974025 + 35832196 = 1405^2 + 5986^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-37806221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37806211) 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, 36965 + ... + 37973.

It is an arithmetic number, because the mean of its divisors is an integer number (4794975).

Almost surely, 2^37806221 is an apocalyptic number.

It is an amenable number.

37806221 is a deficient number, since it is larger than the sum of its proper divisors (553579).

37806221 is a wasteful number, since it uses less digits than its factorization.

37806221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1519.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 37806221 is about 6148.6763616245. The cubic root of 37806221 is about 335.6250926301.

It can be divided in two parts, 3780 and 6221, that added together give a palindrome (10001).

The spelling of 37806221 in words is "thirty-seven million, eight hundred six thousand, two hundred twenty-one".