37947989 has 2 divisors, whose sum is σ = 37947990. Its totient is φ = 37947988.

The previous prime is 37947971. The next prime is 37948013. The reversal of 37947989 is 98974973.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35307364 + 2640625 = 5942^2 + 1625^2 .

It is a cyclic number.

It is not a de Polignac number, because 37947989 - 2⁸ = 37947733 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37947289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18973994 + 18973995.

It is an arithmetic number, because the mean of its divisors is an integer number (18973995).

Almost surely, 2^37947989 is an apocalyptic number.

It is an amenable number.

37947989 is a deficient number, since it is larger than the sum of its proper divisors (1).

37947989 is an equidigital number, since it uses as much as digits as its factorization.

37947989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3429216, while the sum is 56.

The square root of 37947989 is about 6160.1939092856. The cubic root of 37947989 is about 336.0440849421.

The spelling of 37947989 in words is "thirty-seven million, nine hundred forty-seven thousand, nine hundred eighty-nine".