1398878 has 16 divisors (see below), whose sum is σ = 2280096. Its totient is φ = 639840.

The previous prime is 1398871. The next prime is 1398911. The reversal of 1398878 is 8788931.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4343 + ... + 4653.

It is an arithmetic number, because the mean of its divisors is an integer number (142506).

2^1398878 is an apocalyptic number.

1398878 is a deficient number, since it is larger than the sum of its proper divisors (881218).

1398878 is a wasteful number, since it uses less digits than its factorization.

1398878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499.

The product of its digits is 96768, while the sum is 44.

The square root of 1398878 is about 1182.7417300493. The cubic root of 1398878 is about 111.8390012450.

The spelling of 1398878 in words is "one million, three hundred ninety-eight thousand, eight hundred seventy-eight".