19420837 has 2 divisors, whose sum is σ = 19420838. Its totient is φ = 19420836.

The previous prime is 19420829. The next prime is 19420867. The reversal of 19420837 is 73802491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18241441 + 1179396 = 4271^2 + 1086^2 .

It is a cyclic number.

It is not a de Polignac number, because 19420837 - 2³ = 19420829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19420867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9710418 + 9710419.

It is an arithmetic number, because the mean of its divisors is an integer number (9710419).

Almost surely, 2^19420837 is an apocalyptic number.

It is an amenable number.

19420837 is a deficient number, since it is larger than the sum of its proper divisors (1).

19420837 is an equidigital number, since it uses as much as digits as its factorization.

19420837 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 19420837 is about 4406.9078728741. The cubic root of 19420837 is about 268.7959047600.

The spelling of 19420837 in words is "nineteen million, four hundred twenty thousand, eight hundred thirty-seven".