1231978 has 16 divisors (see below), whose sum is σ = 2086560. Its totient is φ = 540400.

The previous prime is 1231961. The next prime is 1231981. The reversal of 1231978 is 8791321.

It is an Ulam number.

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, 328 + ... + 1603.

It is an arithmetic number, because the mean of its divisors is an integer number (130410).

2^1231978 is an apocalyptic number.

1231978 is a deficient number, since it is larger than the sum of its proper divisors (854582).

1231978 is a wasteful number, since it uses less digits than its factorization.

1231978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1973.

The product of its digits is 3024, while the sum is 31.

The square root of 1231978 is about 1109.9450436846. The cubic root of 1231978 is about 107.2015301074.

It can be divided in two parts, 1231 and 978, that added together give a square (2209 = 47²).

The spelling of 1231978 in words is "one million, two hundred thirty-one thousand, nine hundred seventy-eight".