8691438 has 16 divisors (see below), whose sum is σ = 19866240. Its totient is φ = 2483256.

The previous prime is 8691433. The next prime is 8691451. The reversal of 8691438 is 8341968.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 8691396 and 8691405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8691433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103428 + ... + 103511.

It is an arithmetic number, because the mean of its divisors is an integer number (1241640).

Almost surely, 2^8691438 is an apocalyptic number.

8691438 is an abundant number, since it is smaller than the sum of its proper divisors (11174802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8691438 is a wasteful number, since it uses less digits than its factorization.

8691438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206951.

The product of its digits is 41472, while the sum is 39.

The square root of 8691438 is about 2948.1244885520. The cubic root of 8691438 is about 205.6035199274.

The spelling of 8691438 in words is "eight million, six hundred ninety-one thousand, four hundred thirty-eight".