1999172 has 12 divisors (see below), whose sum is σ = 3998400. Its totient is φ = 856776.

The previous prime is 1999163. The next prime is 1999177. The reversal of 1999172 is 2719991.

1999172 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

1999172 is an admirable number.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35672 + ... + 35727.

It is an arithmetic number, because the mean of its divisors is an integer number (333200).

2^1999172 is an apocalyptic number.

It is an amenable number.

1999172 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1999172 is a wasteful number, since it uses less digits than its factorization.

1999172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71410 (or 71408 counting only the distinct ones).

The product of its digits is 10206, while the sum is 38.

The square root of 1999172 is about 1413.9207898606. The cubic root of 1999172 is about 125.9747156791.

The spelling of 1999172 in words is "one million, nine hundred ninety-nine thousand, one hundred seventy-two".