1939800854393 has 2 divisors, whose sum is σ = 1939800854394. Its totient is φ = 1939800854392.

The previous prime is 1939800854389. The next prime is 1939800854437. The reversal of 1939800854393 is 3934580089391.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1551013687609 + 388787166784 = 1245397^2 + 623528^2 .

It is a cyclic number.

It is not a de Polignac number, because 1939800854393 - 2² = 1939800854389 is a prime.

It is not a weakly prime, because it can be changed into another prime (1939800844393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969900427196 + 969900427197.

It is an arithmetic number, because the mean of its divisors is an integer number (969900427197).

Almost surely, 2^{1939800854393} is an apocalyptic number.

It is an amenable number.

1939800854393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1939800854393 is an equidigital number, since it uses as much as digits as its factorization.

1939800854393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25194240, while the sum is 62.

The spelling of 1939800854393 in words is "one trillion, nine hundred thirty-nine billion, eight hundred million, eight hundred fifty-four thousand, three hundred ninety-three".