1897841 has 8 divisors (see below), whose sum is σ = 2126784. Its totient is φ = 1678320.

The previous prime is 1897823. The next prime is 1897843. The reversal of 1897841 is 1487981.

1897841 = 136² + 137² + ... + 201².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1897841 is a prime.

It is a super-2 number, since 2×1897841² = 7203600922562, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1897795 and 1897804.

It is not an unprimeable number, because it can be changed into a prime (1897843) 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 7 ways as a sum of consecutive naturals, for example, 1925 + ... + 2738.

It is an arithmetic number, because the mean of its divisors is an integer number (265848).

2^1897841 is an apocalyptic number.

1897841 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1897841 is a deficient number, since it is larger than the sum of its proper divisors (228943).

1897841 is a wasteful number, since it uses less digits than its factorization.

1897841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4711.

The product of its digits is 16128, while the sum is 38.

The square root of 1897841 is about 1377.6215009937. The cubic root of 1897841 is about 123.8093019180.

The spelling of 1897841 in words is "one million, eight hundred ninety-seven thousand, eight hundred forty-one".