37705981 has 2 divisors, whose sum is σ = 37705982. Its totient is φ = 37705980.

The previous prime is 37705963. The next prime is 37706021. The reversal of 37705981 is 18950773.

It is an a-pointer prime, because the next prime (37706021) can be obtained adding 37705981 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27657081 + 10048900 = 5259^2 + 3170^2 .

It is an emirp because it is prime and its reverse (18950773) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 37705981 - 2⁷ = 37705853 is a prime.

It is a super-2 number, since 2×37705981² = 2843482006344722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37705081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18852990 + 18852991.

It is an arithmetic number, because the mean of its divisors is an integer number (18852991).

Almost surely, 2^37705981 is an apocalyptic number.

It is an amenable number.

37705981 is a deficient number, since it is larger than the sum of its proper divisors (1).

37705981 is an equidigital number, since it uses as much as digits as its factorization.

37705981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 37705981 is about 6140.5196034212. The cubic root of 37705981 is about 335.3282028928.

The spelling of 37705981 in words is "thirty-seven million, seven hundred five thousand, nine hundred eighty-one".