199029780 has 72 divisors (see below), whose sum is σ = 605509632. Its totient is φ = 52917696.

The previous prime is 199029773. The next prime is 199029781. The reversal of 199029780 is 87920991.

It is a super-2 number, since 2×199029780² = 79225706653696800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199029781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67497 + ... + 70383.

It is an arithmetic number, because the mean of its divisors is an integer number (8409856).

Almost surely, 2^199029780 is an apocalyptic number.

199029780 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 199029780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (302754816).

199029780 is an abundant number, since it is smaller than the sum of its proper divisors (406479852).

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

199029780 is a wasteful number, since it uses less digits than its factorization.

199029780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3285 (or 3280 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 199029780 is about 14107.7914642938. The cubic root of 199029780 is about 583.8563675356.

It can be divided in two parts, 199029 and 780, that added together give a square (199809 = 447²).

The spelling of 199029780 in words is "one hundred ninety-nine million, twenty-nine thousand, seven hundred eighty".