69742139 has 4 divisors (see below), whose sum is σ = 69759024. Its totient is φ = 69725256.

The previous prime is 69742097. The next prime is 69742171. The reversal of 69742139 is 93124796.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 69742139 - 2⁸ = 69741883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 69742096 and 69742105.

It is not an unprimeable number, because it can be changed into a prime (69742199) 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, 2369 + ... + 12045.

It is an arithmetic number, because the mean of its divisors is an integer number (17439756).

Almost surely, 2^69742139 is an apocalyptic number.

69742139 is a deficient number, since it is larger than the sum of its proper divisors (16885).

69742139 is an equidigital number, since it uses as much as digits as its factorization.

69742139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16884.

The product of its digits is 81648, while the sum is 41.

The square root of 69742139 is about 8351.1759052244. The cubic root of 69742139 is about 411.6218507674.

The spelling of 69742139 in words is "sixty-nine million, seven hundred forty-two thousand, one hundred thirty-nine".