1997385 has 16 divisors (see below), whose sum is σ = 3441984. Its totient is φ = 983232.

The previous prime is 1997351. The next prime is 1997407. The reversal of 1997385 is 5837991.

It is a happy number.

It is not a de Polignac number, because 1997385 - 2⁶ = 1997321 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4927 + ... + 5316.

It is an arithmetic number, because the mean of its divisors is an integer number (215124).

2^1997385 is an apocalyptic number.

1997385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1997385 is a deficient number, since it is larger than the sum of its proper divisors (1444599).

1997385 is a wasteful number, since it uses less digits than its factorization.

1997385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10264.

The product of its digits is 68040, while the sum is 42.

The square root of 1997385 is about 1413.2887178493. The cubic root of 1997385 is about 125.9371694807.

Subtracting 1997385 from its reverse (5837991), we obtain a triangular number (3840606 = T₂₇₇₁).

The spelling of 1997385 in words is "one million, nine hundred ninety-seven thousand, three hundred eighty-five".