37708421 has 2 divisors, whose sum is σ = 37708422. Its totient is φ = 37708420.

The previous prime is 37708409. The next prime is 37708423. The reversal of 37708421 is 12480773.

It is a happy number.

37708421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31528225 + 6180196 = 5615^2 + 2486^2 .

It is an emirp because it is prime and its reverse (12480773) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 37708421 - 2⁶ = 37708357 is a prime.

It is a Sophie Germain prime.

Together with 37708423, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37708423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18854210 + 18854211.

It is an arithmetic number, because the mean of its divisors is an integer number (18854211).

Almost surely, 2^37708421 is an apocalyptic number.

It is an amenable number.

37708421 is a deficient number, since it is larger than the sum of its proper divisors (1).

37708421 is an equidigital number, since it uses as much as digits as its factorization.

37708421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 37708421 is about 6140.7182804620. The cubic root of 37708421 is about 335.3354359024.

The spelling of 37708421 in words is "thirty-seven million, seven hundred eight thousand, four hundred twenty-one".