1998379 has 2 divisors, whose sum is σ = 1998380. Its totient is φ = 1998378.

The previous prime is 1998371. The next prime is 1998397. The reversal of 1998379 is 9738991.

Together with next prime (1998397) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1998379 - 2³ = 1998371 is a prime.

It is not a weakly prime, because it can be changed into another prime (1998371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999189 + 999190.

It is an arithmetic number, because the mean of its divisors is an integer number (999190).

2^1998379 is an apocalyptic number.

1998379 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998379 is an equidigital number, since it uses as much as digits as its factorization.

1998379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 46.

The square root of 1998379 is about 1413.6403361534. The cubic root of 1998379 is about 125.9580569221.

The spelling of 1998379 in words is "one million, nine hundred ninety-eight thousand, three hundred seventy-nine".