1997739 has 12 divisors (see below), whose sum is σ = 2929576. Its totient is φ = 1311552.

The previous prime is 1997731. The next prime is 1997747. The reversal of 1997739 is 9377991.

It is an interprime number because it is at equal distance from previous prime (1997731) and next prime (1997747).

It is not a de Polignac number, because 1997739 - 2³ = 1997731 is a prime.

It is a super-2 number, since 2×1997739² = 7981922224242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1997694 and 1997703.

It is not an unprimeable number, because it can be changed into a prime (1997731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1054 + ... + 2259.

2^1997739 is an apocalyptic number.

1997739 is a deficient number, since it is larger than the sum of its proper divisors (931837).

1997739 is a wasteful number, since it uses less digits than its factorization.

1997739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3386 (or 3383 counting only the distinct ones).

The product of its digits is 107163, while the sum is 45.

The square root of 1997739 is about 1413.4139521032. The cubic root of 1997739 is about 125.9446090620.

The spelling of 1997739 in words is "one million, nine hundred ninety-seven thousand, seven hundred thirty-nine".