191973240 has 160 divisors (see below), whose sum is σ = 650699280. Its totient is φ = 50761728.

The previous prime is 191973233. The next prime is 191973247. The reversal of 191973240 is 42379191.

It is an interprime number because it is at equal distance from previous prime (191973233) and next prime (191973247).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 191973195 and 191973204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191973247) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 625167 + ... + 625473.

Almost surely, 2^191973240 is an apocalyptic number.

191973240 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 191973240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (325349640).

191973240 is an abundant number, since it is smaller than the sum of its proper divisors (458726040).

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

191973240 is a wasteful number, since it uses less digits than its factorization.

191973240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523 (or 510 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 191973240 is about 13855.4408085777. The cubic root of 191973240 is about 576.8730250732.

The spelling of 191973240 in words is "one hundred ninety-one million, nine hundred seventy-three thousand, two hundred forty".