1898399 has 4 divisors (see below), whose sum is σ = 1907136. Its totient is φ = 1889664.

The previous prime is 1898389. The next prime is 1898417. The reversal of 1898399 is 9938981.

1898399 = T₂ + T₃ + ... + T₂₂₄.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1898399 - 2⁴ = 1898383 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 (1898389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4034 + ... + 4479.

It is an arithmetic number, because the mean of its divisors is an integer number (476784).

2^1898399 is an apocalyptic number.

1898399 is a deficient number, since it is larger than the sum of its proper divisors (8737).

1898399 is an equidigital number, since it uses as much as digits as its factorization.

1898399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8736.

The product of its digits is 139968, while the sum is 47.

The square root of 1898399 is about 1377.8240090810. The cubic root of 1898399 is about 123.8214347961.

The spelling of 1898399 in words is "one million, eight hundred ninety-eight thousand, three hundred ninety-nine".