1897231 has 12 divisors (see below), whose sum is σ = 2280000. Its totient is φ = 1572480.

The previous prime is 1897229. The next prime is 1897237. The reversal of 1897231 is 1327981.

It is not a de Polignac number, because 1897231 - 2¹ = 1897229 is a prime.

It is a super-2 number, since 2×1897231² = 7198970934722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 1897193 and 1897202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1897237) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 895 + ... + 2143.

It is an arithmetic number, because the mean of its divisors is an integer number (190000).

2^1897231 is an apocalyptic number.

1897231 is a deficient number, since it is larger than the sum of its proper divisors (382769).

1897231 is a wasteful number, since it uses less digits than its factorization.

1897231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294 (or 1287 counting only the distinct ones).

The product of its digits is 3024, while the sum is 31.

The square root of 1897231 is about 1377.4000871207. The cubic root of 1897231 is about 123.7960356561.

The spelling of 1897231 in words is "one million, eight hundred ninety-seven thousand, two hundred thirty-one".