1816641 has 16 divisors (see below), whose sum is σ = 2737920. Its totient is φ = 1190160.

The previous prime is 1816627. The next prime is 1816643. The reversal of 1816641 is 1466181.

1816641 is a `hidden beast` number, since 1 + 8 + 16 + 641 = 666.

It is not a de Polignac number, because 1816641 - 2¹⁴ = 1800257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1816643) 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, 1096 + ... + 2198.

It is an arithmetic number, because the mean of its divisors is an integer number (171120).

2^1816641 is an apocalyptic number.

It is an amenable number.

1816641 is a deficient number, since it is larger than the sum of its proper divisors (921279).

1816641 is a wasteful number, since it uses less digits than its factorization.

1816641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173 (or 1167 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 1816641 is about 1347.8282531539. The cubic root of 1816641 is about 122.0177569782.

It can be divided in two parts, 181 and 6641, that multiplied together give a palindrome (1202021).

The spelling of 1816641 in words is "one million, eight hundred sixteen thousand, six hundred forty-one".