40191023 has 4 divisors (see below), whose sum is σ = 42306360. Its totient is φ = 38075688.

The previous prime is 40191001. The next prime is 40191059. The reversal of 40191023 is 32019104.

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

It is a cyclic number.

It is not a de Polignac number, because 40191023 - 2¹⁰ = 40189999 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40190986 and 40191004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40191323) 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, 1057640 + ... + 1057677.

It is an arithmetic number, because the mean of its divisors is an integer number (10576590).

Almost surely, 2^40191023 is an apocalyptic number.

40191023 is a deficient number, since it is larger than the sum of its proper divisors (2115337).

40191023 is a wasteful number, since it uses less digits than its factorization.

40191023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2115336.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 40191023 is about 6339.6390275788. The cubic root of 40191023 is about 342.5387328991.

The spelling of 40191023 in words is "forty million, one hundred ninety-one thousand, twenty-three".