1993538879 has 2 divisors, whose sum is σ = 1993538880. Its totient is φ = 1993538878.

The previous prime is 1993538839. The next prime is 1993538927. The reversal of 1993538879 is 9788353991.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1993538879 - 2¹² = 1993534783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1993538809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 996769439 + 996769440.

It is an arithmetic number, because the mean of its divisors is an integer number (996769440).

Almost surely, 2^1993538879 is an apocalyptic number.

1993538879 is a deficient number, since it is larger than the sum of its proper divisors (1).

1993538879 is an equidigital number, since it uses as much as digits as its factorization.

1993538879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14696640, while the sum is 62.

The square root of 1993538879 is about 44649.0635848054. The cubic root of 1993538879 is about 1258.5628358533.

The spelling of 1993538879 in words is "one billion, nine hundred ninety-three million, five hundred thirty-eight thousand, eight hundred seventy-nine".