19999741 has 4 divisors (see below), whose sum is σ = 20013084. Its totient is φ = 19986400.

The previous prime is 19999739. The next prime is 19999789. The reversal of 19999741 is 14799991.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7425625 + 12574116 = 2725^2 + 3546^2 .

It is a cyclic number.

It is not a de Polignac number, because 19999741 - 2¹ = 19999739 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19990741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4090 + ... + 7531.

It is an arithmetic number, because the mean of its divisors is an integer number (5003271).

Almost surely, 2^19999741 is an apocalyptic number.

It is an amenable number.

19999741 is a deficient number, since it is larger than the sum of its proper divisors (13343).

19999741 is a wasteful number, since it uses less digits than its factorization.

19999741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13342.

The product of its digits is 183708, while the sum is 49.

The square root of 19999741 is about 4472.1069978255. The cubic root of 19999741 is about 271.4405899308.

The spelling of 19999741 in words is "nineteen million, nine hundred ninety-nine thousand, seven hundred forty-one".