40157191 has 4 divisors (see below), whose sum is σ = 40198000. Its totient is φ = 40116384.

The previous prime is 40157189. The next prime is 40157197. The reversal of 40157191 is 19175104.

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 40157191 - 2¹ = 40157189 is a prime.

It is a super-2 number, since 2×40157191² = 3225199978020962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40157197) 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, 18891 + ... + 20908.

It is an arithmetic number, because the mean of its divisors is an integer number (10049500).

Almost surely, 2^40157191 is an apocalyptic number.

40157191 is a deficient number, since it is larger than the sum of its proper divisors (40809).

40157191 is a wasteful number, since it uses less digits than its factorization.

40157191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40808.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 40157191 is about 6336.9701750916. The cubic root of 40157191 is about 342.4425918308.

The spelling of 40157191 in words is "forty million, one hundred fifty-seven thousand, one hundred ninety-one".