1398278 has 8 divisors (see below), whose sum is σ = 2397072. Its totient is φ = 599256.

The previous prime is 1398269. The next prime is 1398281. The reversal of 1398278 is 8728931.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49925 + ... + 49952.

It is an arithmetic number, because the mean of its divisors is an integer number (299634).

2^1398278 is an apocalyptic number.

1398278 is a deficient number, since it is larger than the sum of its proper divisors (998794).

1398278 is an equidigital number, since it uses as much as digits as its factorization.

1398278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99886.

The product of its digits is 24192, while the sum is 38.

The square root of 1398278 is about 1182.4880549080. The cubic root of 1398278 is about 111.8230091435.

The spelling of 1398278 in words is "one million, three hundred ninety-eight thousand, two hundred seventy-eight".