40423191 has 4 divisors (see below), whose sum is σ = 53897592. Its totient is φ = 26948792.

The previous prime is 40423189. The next prime is 40423199. The reversal of 40423191 is 19132404.

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 40423191 - 2¹ = 40423189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40423199) 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, 6737196 + ... + 6737201.

It is an arithmetic number, because the mean of its divisors is an integer number (13474398).

Almost surely, 2^40423191 is an apocalyptic number.

40423191 is a deficient number, since it is larger than the sum of its proper divisors (13474401).

40423191 is a wasteful number, since it uses less digits than its factorization.

40423191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13474400.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 40423191 is about 6357.9234817667. The cubic root of 40423191 is about 343.1970382023.

Adding to 40423191 its reverse (19132404), we get a palindrome (59555595).

The spelling of 40423191 in words is "forty million, four hundred twenty-three thousand, one hundred ninety-one".