109426639 has 4 divisors (see below), whose sum is σ = 125059024. Its totient is φ = 93794256.

The previous prime is 109426633. The next prime is 109426661. The reversal of 109426639 is 936624901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936624901 = 109 ⋅8592889.

It is a cyclic number.

It is not a de Polignac number, because 109426639 - 2³ = 109426631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109426631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7816182 + ... + 7816195.

It is an arithmetic number, because the mean of its divisors is an integer number (31264756).

Almost surely, 2^109426639 is an apocalyptic number.

109426639 is a deficient number, since it is larger than the sum of its proper divisors (15632385).

109426639 is an equidigital number, since it uses as much as digits as its factorization.

109426639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15632384.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 109426639 is about 10460.7188567517. The cubic root of 109426639 is about 478.3080462162.

The spelling of 109426639 in words is "one hundred nine million, four hundred twenty-six thousand, six hundred thirty-nine".