191272440 has 64 divisors (see below), whose sum is σ = 607577760. Its totient is φ = 48005120.

The previous prime is 191272427. The next prime is 191272441. The reversal of 191272440 is 44272191.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 191272398 and 191272407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191272441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44841 + ... + 48920.

Almost surely, 2^191272440 is an apocalyptic number.

191272440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191272440 is an abundant number, since it is smaller than the sum of its proper divisors (416305320).

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

191272440 is a wasteful number, since it uses less digits than its factorization.

191272440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93792 (or 93788 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 191272440 is about 13830.1279820543. The cubic root of 191272440 is about 576.1702091501.

The spelling of 191272440 in words is "one hundred ninety-one million, two hundred seventy-two thousand, four hundred forty".