1398078 has 48 divisors (see below), whose sum is σ = 3459456. Its totient is φ = 403920.

The previous prime is 1398053. The next prime is 1398079. The reversal of 1398078 is 8708931.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398079) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4401 + ... + 4707.

It is an arithmetic number, because the mean of its divisors is an integer number (72072).

2^1398078 is an apocalyptic number.

1398078 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1398078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1729728).

1398078 is an abundant number, since it is smaller than the sum of its proper divisors (2061378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1398078 is a wasteful number, since it uses less digits than its factorization.

1398078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349 (or 346 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 1398078 is about 1182.4034844333. The cubic root of 1398078 is about 111.8176774264.

The spelling of 1398078 in words is "one million, three hundred ninety-eight thousand, seventy-eight".