1240191 has 20 divisors (see below), whose sum is σ = 1890504. Its totient is φ = 810000.

The previous prime is 1240181. The next prime is 1240193. The reversal of 1240191 is 1910421.

1240191 is an esthetic number in base 13, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 1240191 - 2⁵ = 1240159 is a prime.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240193) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4816 + ... + 5066.

2^1240191 is an apocalyptic number.

1240191 is a deficient number, since it is larger than the sum of its proper divisors (650313).

1240191 is an equidigital number, since it uses as much as digits as its factorization.

1240191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324 (or 315 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 1240191 is about 1113.6386307955. The cubic root of 1240191 is about 107.4392229012.

It can be divided in two parts, 1240 and 191, that added together give a triangular number (1431 = T₅₃).

The spelling of 1240191 in words is "one million, two hundred forty thousand, one hundred ninety-one".