1897998 has 16 divisors (see below), whose sum is σ = 3825360. Its totient is φ = 627776.

The previous prime is 1897991. The next prime is 1898009. The reversal of 1897998 is 8997981.

It is a self number, because there is not a number n which added to its sum of digits gives 1897998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1897991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333 + ... + 1976.

It is an arithmetic number, because the mean of its divisors is an integer number (239085).

2^1897998 is an apocalyptic number.

1897998 is an abundant number, since it is smaller than the sum of its proper divisors (1927362).

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

1897998 is a wasteful number, since it uses less digits than its factorization.

1897998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2451.

The product of its digits is 326592, while the sum is 51.

The square root of 1897998 is about 1377.6784820850. The cubic root of 1897998 is about 123.8127158893.

The spelling of 1897998 in words is "one million, eight hundred ninety-seven thousand, nine hundred ninety-eight".