1386978 has 16 divisors (see below), whose sum is σ = 2787456. Its totient is φ = 460080.

The previous prime is 1386977. The next prime is 1386991. The reversal of 1386978 is 8796831.

It is not an unprimeable number, because it can be changed into a prime (1386977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1200 + ... + 2052.

It is an arithmetic number, because the mean of its divisors is an integer number (174216).

2^1386978 is an apocalyptic number.

1386978 is an abundant number, since it is smaller than the sum of its proper divisors (1400478).

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

1386978 is a wasteful number, since it uses less digits than its factorization.

1386978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129.

The product of its digits is 72576, while the sum is 42.

The square root of 1386978 is about 1177.7003014350. The cubic root of 1386978 is about 111.5209663831.

The spelling of 1386978 in words is "one million, three hundred eighty-six thousand, nine hundred seventy-eight".