40691594 has 4 divisors (see below), whose sum is σ = 61037394. Its totient is φ = 20345796.

The previous prime is 40691593. The next prime is 40691617. The reversal of 40691594 is 49519604.

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

It can be written as a sum of positive squares in only one way, i.e., 34869025 + 5822569 = 5905^2 + 2413^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40691593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10172897 + ... + 10172900.

Almost surely, 2^40691594 is an apocalyptic number.

40691594 is a deficient number, since it is larger than the sum of its proper divisors (20345800).

40691594 is a wasteful number, since it uses less digits than its factorization.

40691594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20345799.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 40691594 is about 6378.9963160359. The cubic root of 40691594 is about 343.9549528628.

The spelling of 40691594 in words is "forty million, six hundred ninety-one thousand, five hundred ninety-four".