798649139 has 4 divisors (see below), whose sum is σ = 799502424. Its totient is φ = 797795856.

The previous prime is 798649129. The next prime is 798649199. The reversal of 798649139 is 931946897.

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 798649139 - 2⁴ = 798649123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (798649129) 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, 425237 + ... + 427110.

It is an arithmetic number, because the mean of its divisors is an integer number (199875606).

Almost surely, 2^798649139 is an apocalyptic number.

798649139 is a deficient number, since it is larger than the sum of its proper divisors (853285).

798649139 is an equidigital number, since it uses as much as digits as its factorization.

798649139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853284.

The product of its digits is 2939328, while the sum is 56.

The square root of 798649139 is about 28260.3810837717. The cubic root of 798649139 is about 927.7949605682.

The spelling of 798649139 in words is "seven hundred ninety-eight million, six hundred forty-nine thousand, one hundred thirty-nine".