19997000 has 32 divisors (see below), whose sum is σ = 46795320. Its totient is φ = 7998400.

The previous prime is 19996993. The next prime is 19997011. The reversal of 19997000 is 79991.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9897316 + 10099684 = 3146^2 + 3178^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8999 + ... + 10998.

Almost surely, 2^19997000 is an apocalyptic number.

19997000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19997000 is an abundant number, since it is smaller than the sum of its proper divisors (26798320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19997000 is a wasteful number, since it uses less digits than its factorization.

19997000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20018 (or 20004 counting only the distinct ones).

The product of its (nonzero) digits is 5103, while the sum is 35.

The square root of 19997000 is about 4471.8005322241. The cubic root of 19997000 is about 271.4281888927.

The spelling of 19997000 in words is "nineteen million, nine hundred ninety-seven thousand".