19948739 has 2 divisors, whose sum is σ = 19948740. Its totient is φ = 19948738.

The previous prime is 19948703. The next prime is 19948757. The reversal of 19948739 is 93784991.

It is a strong prime.

It is an emirp because it is prime and its reverse (93784991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19948739 - 2¹⁶ = 19883203 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19948639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9974369 + 9974370.

It is an arithmetic number, because the mean of its divisors is an integer number (9974370).

Almost surely, 2^19948739 is an apocalyptic number.

19948739 is a deficient number, since it is larger than the sum of its proper divisors (1).

19948739 is an equidigital number, since it uses as much as digits as its factorization.

19948739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 50.

The square root of 19948739 is about 4466.4011239476. The cubic root of 19948739 is about 271.2096569787.

The spelling of 19948739 in words is "nineteen million, nine hundred forty-eight thousand, seven hundred thirty-nine".