191241240 has 64 divisors (see below), whose sum is σ = 575134560. Its totient is φ = 50872320.

The previous prime is 191241209. The next prime is 191241257. The reversal of 191241240 is 42142191.

It is a Cunningham number, because it is equal to 13829²-1.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 191241240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53592 + ... + 57048.

Almost surely, 2^191241240 is an apocalyptic number.

191241240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191241240 is an abundant number, since it is smaller than the sum of its proper divisors (383893320).

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

191241240 is a wasteful number, since it uses less digits than its factorization.

191241240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3932 (or 3928 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 191241240 is about 13828.9999638441. Note that the first 4 decimals coincide. The cubic root of 191241240 is about 576.1388795136.

The spelling of 191241240 in words is "one hundred ninety-one million, two hundred forty-one thousand, two hundred forty".