39991019 has 2 divisors, whose sum is σ = 39991020. Its totient is φ = 39991018.

The previous prime is 39991009. The next prime is 39991033. The reversal of 39991019 is 91019993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39991019 - 2¹² = 39986923 is a prime.

It is a super-2 number, since 2×39991019² = 3198563201316722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39991009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19995509 + 19995510.

It is an arithmetic number, because the mean of its divisors is an integer number (19995510).

Almost surely, 2^39991019 is an apocalyptic number.

39991019 is a deficient number, since it is larger than the sum of its proper divisors (1).

39991019 is an equidigital number, since it uses as much as digits as its factorization.

39991019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19683, while the sum is 41.

The square root of 39991019 is about 6323.8452700869. The cubic root of 39991019 is about 341.9695919295.

The spelling of 39991019 in words is "thirty-nine million, nine hundred ninety-one thousand, nineteen".