2139449794 has 4 divisors (see below), whose sum is σ = 3209174694. Its totient is φ = 1069724896.

The previous prime is 2139449789. The next prime is 2139449831. The reversal of 2139449794 is 4979449312.

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

It can be written as a sum of positive squares in only one way, i.e., 2080728225 + 58721569 = 45615^2 + 7663^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 534862447 + ... + 534862450.

Almost surely, 2^2139449794 is an apocalyptic number.

2139449794 is a deficient number, since it is larger than the sum of its proper divisors (1069724900).

2139449794 is a wasteful number, since it uses less digits than its factorization.

2139449794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069724899.

The product of its digits is 1959552, while the sum is 52.

The square root of 2139449794 is about 46254.1867726588. The cubic root of 2139449794 is about 1288.5482926128.

The spelling of 2139449794 in words is "two billion, one hundred thirty-nine million, four hundred forty-nine thousand, seven hundred ninety-four".