1397878 has 4 divisors (see below), whose sum is σ = 2096820. Its totient is φ = 698938.

The previous prime is 1397873. The next prime is 1397881. The reversal of 1397878 is 8787931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8787931 = 617 ⋅14243.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397873) 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 as a sum of consecutive naturals, namely, 349468 + ... + 349471.

It is an arithmetic number, because the mean of its divisors is an integer number (524205).

2^1397878 is an apocalyptic number.

1397878 is a deficient number, since it is larger than the sum of its proper divisors (698942).

1397878 is an equidigital number, since it uses as much as digits as its factorization.

1397878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698941.

The product of its digits is 84672, while the sum is 43.

The square root of 1397878 is about 1182.3189079094. The cubic root of 1397878 is about 111.8123452008.

The spelling of 1397878 in words is "one million, three hundred ninety-seven thousand, eight hundred seventy-eight".