1997516 has 24 divisors (see below), whose sum is σ = 3669120. Its totient is φ = 950400.

The previous prime is 1997507. The next prime is 1997531. The reversal of 1997516 is 6157991.

It is a self number, because there is not a number n which added to its sum of digits gives 1997516.

It is an unprimeable number.

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, 10946 + ... + 11126.

It is an arithmetic number, because the mean of its divisors is an integer number (152880).

2^1997516 is an apocalyptic number.

It is an amenable number.

1997516 is a deficient number, since it is larger than the sum of its proper divisors (1671604).

1997516 is a wasteful number, since it uses less digits than its factorization.

1997516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305 (or 303 counting only the distinct ones).

The product of its digits is 17010, while the sum is 38.

The square root of 1997516 is about 1413.3350628920. The cubic root of 1997516 is about 125.9399226486.

It can be divided in two parts, 19975 and 16, that multiplied together give a triangular number (319600 = T₇₉₉).

The spelling of 1997516 in words is "one million, nine hundred ninety-seven thousand, five hundred sixteen".