1993997 has 2 divisors, whose sum is σ = 1993998. Its totient is φ = 1993996.

The previous prime is 1993991. The next prime is 1994033. The reversal of 1993997 is 7993991.

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., 1976836 + 17161 = 1406^2 + 131^2 .

It is a cyclic number.

It is not a de Polignac number, because 1993997 - 2⁶ = 1993933 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1993991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 996998 + 996999.

It is an arithmetic number, because the mean of its divisors is an integer number (996999).

2^1993997 is an apocalyptic number.

It is an amenable number.

1993997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1993997 is an equidigital number, since it uses as much as digits as its factorization.

1993997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 137781, while the sum is 47.

The square root of 1993997 is about 1412.0895863932. The cubic root of 1993997 is about 125.8659235596.

It can be divided in two parts, 1993 and 997, that multiplied together give a triangular number (1987021 = T₁₉₉₃).

The spelling of 1993997 in words is "one million, nine hundred ninety-three thousand, nine hundred ninety-seven".