1800399 has 8 divisors (see below), whose sum is σ = 2433712. Its totient is φ = 1183680.

The previous prime is 1800397. The next prime is 1800401. The reversal of 1800399 is 9930081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1800397) and next prime (1800401).

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

It is not a de Polignac number, because 1800399 - 2¹ = 1800397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1800397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3892 + ... + 4329.

It is an arithmetic number, because the mean of its divisors is an integer number (304214).

2^1800399 is an apocalyptic number.

1800399 is a deficient number, since it is larger than the sum of its proper divisors (633313).

1800399 is an equidigital number, since it uses as much as digits as its factorization.

1800399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8297.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 1800399 is about 1341.7894767809. The cubic root of 1800399 is about 121.6530273904.

The spelling of 1800399 in words is "one million, eight hundred thousand, three hundred ninety-nine".