69138889 has 4 divisors (see below), whose sum is σ = 69155856. Its totient is φ = 69121924.

The previous prime is 69138887. The next prime is 69138899. The reversal of 69138889 is 98883196.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 69138889 - 2¹ = 69138887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69138887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1722 + ... + 11884.

It is an arithmetic number, because the mean of its divisors is an integer number (17288964).

Almost surely, 2^69138889 is an apocalyptic number.

It is an amenable number.

69138889 is a deficient number, since it is larger than the sum of its proper divisors (16967).

69138889 is a wasteful number, since it uses less digits than its factorization.

69138889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16966.

The product of its digits is 746496, while the sum is 52.

The square root of 69138889 is about 8314.9797955257. The cubic root of 69138889 is about 410.4316077508.

The spelling of 69138889 in words is "sixty-nine million, one hundred thirty-eight thousand, eight hundred eighty-nine".