19990741 has 2 divisors, whose sum is σ = 19990742. Its totient is φ = 19990740.

The previous prime is 19990721. The next prime is 19990757. The reversal of 19990741 is 14709991.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19989841 + 900 = 4471^2 + 30^2 .

It is a cyclic number.

It is not a de Polignac number, because 19990741 - 2⁷ = 19990613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19990694 and 19990703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19990721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9995370 + 9995371.

It is an arithmetic number, because the mean of its divisors is an integer number (9995371).

Almost surely, 2^19990741 is an apocalyptic number.

It is an amenable number.

19990741 is a deficient number, since it is larger than the sum of its proper divisors (1).

19990741 is an equidigital number, since it uses as much as digits as its factorization.

19990741 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 40.

The square root of 19990741 is about 4471.1006474916. The cubic root of 19990741 is about 271.3998672060.

The spelling of 19990741 in words is "nineteen million, nine hundred ninety thousand, seven hundred forty-one".