40639191 has 8 divisors (see below), whose sum is σ = 54215040. Its totient is φ = 27078072.

The previous prime is 40639189. The next prime is 40639199. The reversal of 40639191 is 19193604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40639191 - 2¹ = 40639189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40639199) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9000 + ... + 12738.

It is an arithmetic number, because the mean of its divisors is an integer number (6776880).

Almost surely, 2^40639191 is an apocalyptic number.

40639191 is a deficient number, since it is larger than the sum of its proper divisors (13575849).

40639191 is a wasteful number, since it uses less digits than its factorization.

40639191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7365.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 40639191 is about 6374.8875284196. The cubic root of 40639191 is about 343.8072400108.

The spelling of 40639191 in words is "forty million, six hundred thirty-nine thousand, one hundred ninety-one".