19991802 has 16 divisors (see below), whose sum is σ = 40101120. Its totient is φ = 6644352.

The previous prime is 19991801. The next prime is 19991821. The reversal of 19991802 is 20819991.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (19991801) 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, 2602 + ... + 6837.

It is an arithmetic number, because the mean of its divisors is an integer number (2506320).

Almost surely, 2^19991802 is an apocalyptic number.

19991802 is an abundant number, since it is smaller than the sum of its proper divisors (20109318).

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

19991802 is a wasteful number, since it uses less digits than its factorization.

19991802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9797.

The product of its (nonzero) digits is 11664, while the sum is 39.

The square root of 19991802 is about 4471.2192967914. The cubic root of 19991802 is about 271.4046685982.

The spelling of 19991802 in words is "nineteen million, nine hundred ninety-one thousand, eight hundred two".