1897641 has 16 divisors (see below), whose sum is σ = 2856000. Its totient is φ = 1245024.

The previous prime is 1897639. The next prime is 1897667. The reversal of 1897641 is 1467981.

1897641 is a `hidden beast` number, since 1 + 8 + 9 + 7 + 641 = 666.

It is not a de Polignac number, because 1897641 - 2¹ = 1897639 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1897596 and 1897605.

It is not an unprimeable number, because it can be changed into a prime (1897601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1285 + ... + 2333.

It is an arithmetic number, because the mean of its divisors is an integer number (178500).

2^1897641 is an apocalyptic number.

It is an amenable number.

1897641 is a deficient number, since it is larger than the sum of its proper divisors (958359).

1897641 is a wasteful number, since it uses less digits than its factorization.

1897641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125 (or 1119 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 1897641 is about 1377.5489102025. The cubic root of 1897641 is about 123.8049526372.

The spelling of 1897641 in words is "one million, eight hundred ninety-seven thousand, six hundred forty-one".