1997039 has 4 divisors (see below), whose sum is σ = 2178600. Its totient is φ = 1815480.

The previous prime is 1997029. The next prime is 1997053. The reversal of 1997039 is 9307991.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1997039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1996993 and 1997011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90764 + ... + 90785.

It is an arithmetic number, because the mean of its divisors is an integer number (544650).

2^1997039 is an apocalyptic number.

1997039 is a deficient number, since it is larger than the sum of its proper divisors (181561).

1997039 is a wasteful number, since it uses less digits than its factorization.

1997039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181560.

The product of its (nonzero) digits is 15309, while the sum is 38.

The square root of 1997039 is about 1413.1663030231. The cubic root of 1997039 is about 125.9298971760.

Subtracting from 1997039 its sum of digits (38), we obtain a triangular number (1997001 = T₁₉₉₈).

The spelling of 1997039 in words is "one million, nine hundred ninety-seven thousand, thirty-nine".