1997650 has 12 divisors (see below), whose sum is σ = 3715722. Its totient is φ = 799040.

The previous prime is 1997647. The next prime is 1997657. The reversal of 1997650 is 567991.

It can be written as a sum of positive squares in 3 ways, for example, as 1687401 + 310249 = 1299^2 + 557^2 .

It is not an unprimeable number, because it can be changed into a prime (1997657) 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 5 ways as a sum of consecutive naturals, for example, 19927 + ... + 20026.

2^1997650 is an apocalyptic number.

1997650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1997650 is a deficient number, since it is larger than the sum of its proper divisors (1718072).

1997650 is a wasteful number, since it uses less digits than its factorization.

1997650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39965 (or 39960 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 1997650 is about 1413.3824676994. The cubic root of 1997650 is about 125.9427387415.

The spelling of 1997650 in words is "one million, nine hundred ninety-seven thousand, six hundred fifty".