191449980 has 108 divisors (see below), whose sum is σ = 603450120. Its totient is φ = 51018336.

The previous prime is 191449961. The next prime is 191449991. The reversal of 191449980 is 89944191.

It is a tau number, because it is divible by the number of its divisors (108).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 130491 + ... + 131949.

Almost surely, 2^191449980 is an apocalyptic number.

191449980 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 191449980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (301725060).

191449980 is an abundant number, since it is smaller than the sum of its proper divisors (412000140).

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

191449980 is an equidigital number, since it uses as much as digits as its factorization.

191449980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1492 (or 1469 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 191449980 is about 13836.5450890025. The cubic root of 191449980 is about 576.3484220098.

The spelling of 191449980 in words is "one hundred ninety-one million, four hundred forty-nine thousand, nine hundred eighty".