1999004057 has 2 divisors, whose sum is σ = 1999004058. Its totient is φ = 1999004056.

The previous prime is 1999004023. The next prime is 1999004087. The reversal of 1999004057 is 7504009991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1955496841 + 43507216 = 44221^2 + 6596^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1999004057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1999003999 and 1999004017.

It is not a weakly prime, because it can be changed into another prime (1999004087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999502028 + 999502029.

It is an arithmetic number, because the mean of its divisors is an integer number (999502029).

Almost surely, 2^1999004057 is an apocalyptic number.

It is an amenable number.

1999004057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999004057 is an equidigital number, since it uses as much as digits as its factorization.

1999004057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 1999004057 is about 44710.2231821761. The cubic root of 1999004057 is about 1259.7118802458.

The spelling of 1999004057 in words is "one billion, nine hundred ninety-nine million, four thousand, fifty-seven".