19860001200 has 840 divisors, whose sum is σ = 79996407680. Its totient is φ = 4730918400.

The previous prime is 19860001177. The next prime is 19860001201. The reversal of 19860001200 is 210006891.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (19860001201) by changing a digit.

It is a polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 640645185 + ... + 640645215.

Almost surely, 2^19860001200 is an apocalyptic number.

19860001200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19860001200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39998203840).

19860001200 is an abundant number, since it is smaller than the sum of its proper divisors (60136406480).

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

19860001200 is an equidigital number, since it uses as much as digits as its factorization.

19860001200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 54 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The spelling of 19860001200 in words is "nineteen billion, eight hundred sixty million, one thousand, two hundred".