69444138 has 16 divisors (see below), whose sum is σ = 139043520. Its totient is φ = 23122176.

The previous prime is 69444127. The next prime is 69444149. The reversal of 69444138 is 83144496.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (69444127) and next prime (69444149).

It is a junction number, because it is equal to n+sod(n) for n = 69444096 and 69444105.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183 + ... + 11786.

It is an arithmetic number, because the mean of its divisors is an integer number (8690220).

Almost surely, 2^69444138 is an apocalyptic number.

69444138 is an abundant number, since it is smaller than the sum of its proper divisors (69599382).

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

69444138 is a wasteful number, since it uses less digits than its factorization.

69444138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12941.

The product of its digits is 82944, while the sum is 39.

The square root of 69444138 is about 8333.3149466464. The cubic root of 69444138 is about 411.0347411153.

The spelling of 69444138 in words is "sixty-nine million, four hundred forty-four thousand, one hundred thirty-eight".