1897849 has 6 divisors (see below), whose sum is σ = 1946990. Its totient is φ = 1849920.

The previous prime is 1897843. The next prime is 1897871. The reversal of 1897849 is 9487981.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 310249 + 1587600 = 557^2 + 1260^2 .

It is not a de Polignac number, because 1897849 - 2¹⁵ = 1865081 is a prime.

It is a Duffinian number.

1897849 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1897799 and 1897808.

It is not an unprimeable number, because it can be changed into a prime (1897843) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1117 + ... + 2245.

2^1897849 is an apocalyptic number.

It is an amenable number.

1897849 is a deficient number, since it is larger than the sum of its proper divisors (49141).

1897849 is an equidigital number, since it uses as much as digits as its factorization.

1897849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1211 (or 1170 counting only the distinct ones).

The product of its digits is 145152, while the sum is 46.

The square root of 1897849 is about 1377.6244045457. The cubic root of 1897849 is about 123.8094758829.

The spelling of 1897849 in words is "one million, eight hundred ninety-seven thousand, eight hundred forty-nine".