1388978 has 16 divisors (see below), whose sum is σ = 2160000. Its totient is φ = 669552.

The previous prime is 1388969. The next prime is 1389001. The reversal of 1388978 is 8798831.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9248 + ... + 9396.

It is an arithmetic number, because the mean of its divisors is an integer number (135000).

2^1388978 is an apocalyptic number.

1388978 is a deficient number, since it is larger than the sum of its proper divisors (771022).

1388978 is a wasteful number, since it uses less digits than its factorization.

1388978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289.

The product of its digits is 96768, while the sum is 44.

The square root of 1388978 is about 1178.5491080137. The cubic root of 1388978 is about 111.5745444526.

The spelling of 1388978 in words is "one million, three hundred eighty-eight thousand, nine hundred seventy-eight".