3691918 has 4 divisors (see below), whose sum is σ = 5537880. Its totient is φ = 1845958.

The previous prime is 3691913. The next prime is 3691921. The reversal of 3691918 is 8191963.

3691918 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8191963 = 13 ⋅630151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3691913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 922978 + ... + 922981.

It is an arithmetic number, because the mean of its divisors is an integer number (1384470).

Almost surely, 2^3691918 is an apocalyptic number.

3691918 is a deficient number, since it is larger than the sum of its proper divisors (1845962).

3691918 is a wasteful number, since it uses less digits than its factorization.

3691918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1845961.

The product of its digits is 11664, while the sum is 37.

The square root of 3691918 is about 1921.4364418320. The cubic root of 3691918 is about 154.5553402295. Note that the first 3 decimals are identical.

The spelling of 3691918 in words is "three million, six hundred ninety-one thousand, nine hundred eighteen".