1578978 has 12 divisors (see below), whose sum is σ = 3421158. Its totient is φ = 526320.

The previous prime is 1578961. The next prime is 1578979. The reversal of 1578978 is 8798751.

1578978 is a `hidden beast` number, since 1 + 578 + 9 + 78 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1447209 + 131769 = 1203^2 + 363^2 .

It is not an unprimeable number, because it can be changed into a prime (1578979) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43843 + ... + 43878.

2^1578978 is an apocalyptic number.

1578978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1578978 is an abundant number, since it is smaller than the sum of its proper divisors (1842180).

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

1578978 is a wasteful number, since it uses less digits than its factorization.

1578978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87729 (or 87726 counting only the distinct ones).

The product of its digits is 141120, while the sum is 45.

The square root of 1578978 is about 1256.5739134647. The cubic root of 1578978 is about 116.4462104402.

It can be divided in two parts, 1578 and 978, that added together give a triangular number (2556 = T₇₁).

The spelling of 1578978 in words is "one million, five hundred seventy-eight thousand, nine hundred seventy-eight".