40191111 has 48 divisors (see below), whose sum is σ = 64864800. Its totient is φ = 23869440.

The previous prime is 40191101. The next prime is 40191113. The reversal of 40191111 is 11119104.

It is not a de Polignac number, because 40191111 - 2⁵ = 40191079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40191113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 269665 + ... + 269813.

It is an arithmetic number, because the mean of its divisors is an integer number (1351350).

Almost surely, 2^40191111 is an apocalyptic number.

40191111 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

40191111 is a deficient number, since it is larger than the sum of its proper divisors (24673689).

40191111 is a wasteful number, since it uses less digits than its factorization.

40191111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256 (or 253 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

The square root of 40191111 is about 6339.6459680332. The cubic root of 40191111 is about 342.5389829001.

The spelling of 40191111 in words is "forty million, one hundred ninety-one thousand, one hundred eleven".