1399078 has 4 divisors (see below), whose sum is σ = 2098620. Its totient is φ = 699538.

The previous prime is 1399063. The next prime is 1399109. The reversal of 1399078 is 8709931.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349768 + ... + 349771.

It is an arithmetic number, because the mean of its divisors is an integer number (524655).

2^1399078 is an apocalyptic number.

1399078 is a deficient number, since it is larger than the sum of its proper divisors (699542).

1399078 is an equidigital number, since it uses as much as digits as its factorization.

1399078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699541.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 1399078 is about 1182.8262763399. The cubic root of 1399078 is about 111.8443309293.

The spelling of 1399078 in words is "one million, three hundred ninety-nine thousand, seventy-eight".