40191793 has 4 divisors (see below), whose sum is σ = 40223988. Its totient is φ = 40159600.

The previous prime is 40191773. The next prime is 40191797. The reversal of 40191793 is 39719104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4765489 + 35426304 = 2183^2 + 5952^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40191793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40191797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14146 + ... + 16747.

It is an arithmetic number, because the mean of its divisors is an integer number (10055997).

Almost surely, 2^40191793 is an apocalyptic number.

It is an amenable number.

40191793 is a deficient number, since it is larger than the sum of its proper divisors (32195).

40191793 is a wasteful number, since it uses less digits than its factorization.

40191793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32194.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 40191793 is about 6339.6997562976. The cubic root of 40191793 is about 342.5409203954.

The spelling of 40191793 in words is "forty million, one hundred ninety-one thousand, seven hundred ninety-three".