39221989 has 2 divisors, whose sum is σ = 39221990. Its totient is φ = 39221988.

The previous prime is 39221983. The next prime is 39221993. The reversal of 39221989 is 98912293.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37822500 + 1399489 = 6150^2 + 1183^2 .

It is a cyclic number.

It is not a de Polignac number, because 39221989 - 2¹¹ = 39219941 is a prime.

It is a super-2 number, since 2×39221989² = 3076728842232242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39221983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19610994 + 19610995.

It is an arithmetic number, because the mean of its divisors is an integer number (19610995).

Almost surely, 2^39221989 is an apocalyptic number.

It is an amenable number.

39221989 is a deficient number, since it is larger than the sum of its proper divisors (1).

39221989 is an equidigital number, since it uses as much as digits as its factorization.

39221989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 43.

The square root of 39221989 is about 6262.7461229081. The cubic root of 39221989 is about 339.7633560926.

The spelling of 39221989 in words is "thirty-nine million, two hundred twenty-one thousand, nine hundred eighty-nine".