1898145 has 12 divisors (see below), whose sum is σ = 3290196. Its totient is φ = 1012320.

The previous prime is 1898131. The next prime is 1898153. The reversal of 1898145 is 5418981.

It can be written as a sum of positive squares in 2 ways, for example, as 318096 + 1580049 = 564^2 + 1257^2 .

It is not a de Polignac number, because 1898145 - 2¹⁰ = 1897121 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21046 + ... + 21135.

It is an arithmetic number, because the mean of its divisors is an integer number (274183).

2^1898145 is an apocalyptic number.

1898145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1898145 is a deficient number, since it is larger than the sum of its proper divisors (1392051).

1898145 is a wasteful number, since it uses less digits than its factorization.

1898145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42192 (or 42189 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 1898145 is about 1377.7318316712. The cubic root of 1898145 is about 123.8159122396.

The spelling of 1898145 in words is "one million, eight hundred ninety-eight thousand, one hundred forty-five".