19850869 has 2 divisors, whose sum is σ = 19850870. Its totient is φ = 19850868.

The previous prime is 19850851. The next prime is 19850891. The reversal of 19850869 is 96805891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19847025 + 3844 = 4455^2 + 62^2 .

It is a cyclic number.

It is not a de Polignac number, because 19850869 - 2¹³ = 19842677 is a prime.

It is a super-2 number, since 2×19850869² = 788114000110322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19850899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9925434 + 9925435.

It is an arithmetic number, because the mean of its divisors is an integer number (9925435).

Almost surely, 2^19850869 is an apocalyptic number.

It is an amenable number.

19850869 is a deficient number, since it is larger than the sum of its proper divisors (1).

19850869 is an equidigital number, since it uses as much as digits as its factorization.

19850869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 19850869 is about 4455.4314044770. The cubic root of 19850869 is about 270.7654047444.

The spelling of 19850869 in words is "nineteen million, eight hundred fifty thousand, eight hundred sixty-nine".