19780086 has 16 divisors (see below), whose sum is σ = 40480704. Its totient is φ = 6439944.

The previous prime is 19780073. The next prime is 19780087. The reversal of 19780086 is 68008791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19780087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38076 + ... + 38591.

It is an arithmetic number, because the mean of its divisors is an integer number (2530044).

Almost surely, 2^19780086 is an apocalyptic number.

19780086 is an abundant number, since it is smaller than the sum of its proper divisors (20700618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19780086 is a wasteful number, since it uses less digits than its factorization.

19780086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76715.

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 19780086 is about 4447.4808599925. The cubic root of 19780086 is about 270.4431952952.

The spelling of 19780086 in words is "nineteen million, seven hundred eighty thousand, eighty-six".