39219997 has 2 divisors, whose sum is σ = 39219998. Its totient is φ = 39219996.

The previous prime is 39219979. The next prime is 39220001. The reversal of 39219997 is 79991293.

Together with previous prime (39219979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32558436 + 6661561 = 5706^2 + 2581^2 .

It is a cyclic number.

It is not a de Polignac number, because 39219997 - 2¹⁵ = 39187229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39219997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39219797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19609998 + 19609999.

It is an arithmetic number, because the mean of its divisors is an integer number (19609999).

Almost surely, 2^39219997 is an apocalyptic number.

It is an amenable number.

39219997 is a deficient number, since it is larger than the sum of its proper divisors (1).

39219997 is an equidigital number, since it uses as much as digits as its factorization.

39219997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 275562, while the sum is 49.

The square root of 39219997 is about 6262.5870852228. The cubic root of 39219997 is about 339.7576040465.

The spelling of 39219997 in words is "thirty-nine million, two hundred nineteen thousand, nine hundred ninety-seven".