68994139 has 4 divisors (see below), whose sum is σ = 69101424. Its totient is φ = 68886856.

The previous prime is 68994137. The next prime is 68994157. The reversal of 68994139 is 93149986.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68994139 - 2¹ = 68994137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68994092 and 68994101.

It is not an unprimeable number, because it can be changed into a prime (68994131) 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, 52672 + ... + 53965.

It is an arithmetic number, because the mean of its divisors is an integer number (17275356).

Almost surely, 2^68994139 is an apocalyptic number.

68994139 is a deficient number, since it is larger than the sum of its proper divisors (107285).

68994139 is a wasteful number, since it uses less digits than its factorization.

68994139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107284.

The product of its digits is 419904, while the sum is 49.

The square root of 68994139 is about 8306.2710646836. The cubic root of 68994139 is about 410.1449794637.

The spelling of 68994139 in words is "sixty-eight million, nine hundred ninety-four thousand, one hundred thirty-nine".