1943399039 has 2 divisors, whose sum is σ = 1943399040. Its totient is φ = 1943399038.

The previous prime is 1943399027. The next prime is 1943399093. The reversal of 1943399039 is 9309933491.

It is a happy number.

Together with next prime (1943399093) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1943399039 is a prime.

It is a super-2 number, since 2×1943399039² = 7553599649572247042, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1943399239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 971699519 + 971699520.

It is an arithmetic number, because the mean of its divisors is an integer number (971699520).

Almost surely, 2^1943399039 is an apocalyptic number.

1943399039 is a deficient number, since it is larger than the sum of its proper divisors (1).

1943399039 is an equidigital number, since it uses as much as digits as its factorization.

1943399039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 708588, while the sum is 50.

The square root of 1943399039 is about 44083.9998071863. Note that the first 3 decimals coincide. The cubic root of 1943399039 is about 1247.9216746862.

The spelling of 1943399039 in words is "one billion, nine hundred forty-three million, three hundred ninety-nine thousand, thirty-nine".