1997775 has 36 divisors (see below), whose sum is σ = 3859128. Its totient is φ = 982080.

The previous prime is 1997773. The next prime is 1997813. The reversal of 1997775 is 5777991.

1997775 is nontrivially palindromic in base 2 and base 14.

It is not a de Polignac number, because 1997775 - 2¹ = 1997773 is a prime.

It is a super-2 number, since 2×1997775² = 7982209901250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1997775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997771) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2584 + ... + 3266.

It is an arithmetic number, because the mean of its divisors is an integer number (107198).

2^1997775 is an apocalyptic number.

1997775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1997775 is a deficient number, since it is larger than the sum of its proper divisors (1861353).

1997775 is a wasteful number, since it uses less digits than its factorization.

1997775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712 (or 704 counting only the distinct ones).

The product of its digits is 138915, while the sum is 45.

The square root of 1997775 is about 1413.4266871685. The cubic root of 1997775 is about 125.9453655804.

It can be divided in two parts, 1997 and 775, that added together give a palindrome (2772).

The spelling of 1997775 in words is "one million, nine hundred ninety-seven thousand, seven hundred seventy-five".