1997355 has 8 divisors (see below), whose sum is σ = 3195792. Its totient is φ = 1065248.

The previous prime is 1997351. The next prime is 1997407. The reversal of 1997355 is 5537991.

1997355 is nontrivially palindromic in base 9.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1997355 - 2² = 1997351 is a prime.

1997355 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1997351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66564 + ... + 66593.

It is an arithmetic number, because the mean of its divisors is an integer number (399474).

2^1997355 is an apocalyptic number.

1997355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1997355 is a deficient number, since it is larger than the sum of its proper divisors (1198437).

1997355 is a wasteful number, since it uses less digits than its factorization.

1997355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133165.

The product of its digits is 42525, while the sum is 39.

The square root of 1997355 is about 1413.2781042668. The cubic root of 1997355 is about 125.9365389673.

The spelling of 1997355 in words is "one million, nine hundred ninety-seven thousand, three hundred fifty-five".