37694821 has 2 divisors, whose sum is σ = 37694822. Its totient is φ = 37694820.

The previous prime is 37694801. The next prime is 37694827. The reversal of 37694821 is 12849673.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20802721 + 16892100 = 4561^2 + 4110^2 .

It is an emirp because it is prime and its reverse (12849673) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 37694821 - 2¹¹ = 37692773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37694827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18847410 + 18847411.

It is an arithmetic number, because the mean of its divisors is an integer number (18847411).

Almost surely, 2^37694821 is an apocalyptic number.

It is an amenable number.

37694821 is a deficient number, since it is larger than the sum of its proper divisors (1).

37694821 is an equidigital number, since it uses as much as digits as its factorization.

37694821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 40.

The square root of 37694821 is about 6139.6108182848. The cubic root of 37694821 is about 335.2951167889.

The spelling of 37694821 in words is "thirty-seven million, six hundred ninety-four thousand, eight hundred twenty-one".