1943399057 has 6 divisors (see below), whose sum is σ = 1991956854. Its totient is φ = 1895997440.

The previous prime is 1943399039. The next prime is 1943399093. The reversal of 1943399057 is 7509933491.

It is a Cunningham number, because it is equal to 44084²+1.

It can be written as a sum of positive squares in 3 ways, for example, as 1 + 1943399056 = 1^2 + 44084^2 .

It is not a de Polignac number, because 1943399057 - 2¹⁶ = 1943333521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1943398996 and 1943399014.

It is not an unprimeable number, because it can be changed into a prime (1943399027) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 576368 + ... + 579729.

It is an arithmetic number, because the mean of its divisors is an integer number (331992809).

Almost surely, 2^1943399057 is an apocalyptic number.

It is an amenable number.

1943399057 is a deficient number, since it is larger than the sum of its proper divisors (48557797).

1943399057 is an equidigital number, since it uses as much as digits as its factorization.

1943399057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156179 (or 1156138 counting only the distinct ones).

The product of its (nonzero) digits is 918540, while the sum is 50.

The square root of 1943399057 is about 44084.0000113420. Note that the first 4 decimals coincide. The cubic root of 1943399057 is about 1247.9216785390.

The spelling of 1943399057 in words is "one billion, nine hundred forty-three million, three hundred ninety-nine thousand, fifty-seven".