1816949 has 2 divisors, whose sum is σ = 1816950. Its totient is φ = 1816948.

The previous prime is 1816933. The next prime is 1816957. The reversal of 1816949 is 9496181.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1188100 + 628849 = 1090^2 + 793^2 .

It is a cyclic number.

It is not a de Polignac number, because 1816949 - 2⁴ = 1816933 is a prime.

It is a Chen prime.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1816979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 908474 + 908475.

It is an arithmetic number, because the mean of its divisors is an integer number (908475).

2^1816949 is an apocalyptic number.

It is an amenable number.

1816949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1816949 is an equidigital number, since it uses as much as digits as its factorization.

1816949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 38.

The square root of 1816949 is about 1347.9425061923. The cubic root of 1816949 is about 122.0246523684.

The spelling of 1816949 in words is "one million, eight hundred sixteen thousand, nine hundred forty-nine".