1939889347 has 4 divisors (see below), whose sum is σ = 2116242936. Its totient is φ = 1763535760.

The previous prime is 1939889321. The next prime is 1939889351. The reversal of 1939889347 is 7439889391.

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 1939889347 - 2⁷ = 1939889219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1939889747) 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, 88176778 + ... + 88176799.

It is an arithmetic number, because the mean of its divisors is an integer number (529060734).

Almost surely, 2^1939889347 is an apocalyptic number.

1939889347 is a deficient number, since it is larger than the sum of its proper divisors (176353589).

1939889347 is a wasteful number, since it uses less digits than its factorization.

1939889347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176353588.

The product of its digits is 11757312, while the sum is 61.

The square root of 1939889347 is about 44044.1749497025. The cubic root of 1939889347 is about 1247.1699917044.

The spelling of 1939889347 in words is "one billion, nine hundred thirty-nine million, eight hundred eighty-nine thousand, three hundred forty-seven".