19979413 has 2 divisors, whose sum is σ = 19979414. Its totient is φ = 19979412.

The previous prime is 19979411. The next prime is 19979419. The reversal of 19979413 is 31497991.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17783089 + 2196324 = 4217^2 + 1482^2 .

It is a cyclic number.

It is not a de Polignac number, because 19979413 - 2¹ = 19979411 is a prime.

Together with 19979411, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 19979413.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19979411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9989706 + 9989707.

It is an arithmetic number, because the mean of its divisors is an integer number (9989707).

Almost surely, 2^19979413 is an apocalyptic number.

It is an amenable number.

19979413 is a deficient number, since it is larger than the sum of its proper divisors (1).

19979413 is an equidigital number, since it uses as much as digits as its factorization.

19979413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 43.

The square root of 19979413 is about 4469.8336658091. The cubic root of 19979413 is about 271.3485934922.

The spelling of 19979413 in words is "nineteen million, nine hundred seventy-nine thousand, four hundred thirteen".