1329978 has 48 divisors (see below), whose sum is σ = 3094560. Its totient is φ = 378624.

The previous prime is 1329971. The next prime is 1330001. The reversal of 1329978 is 8799231.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1329971) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22513 + ... + 22571.

It is an arithmetic number, because the mean of its divisors is an integer number (64470).

2^1329978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1329978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1547280).

1329978 is an abundant number, since it is smaller than the sum of its proper divisors (1764582).

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

1329978 is a wasteful number, since it uses less digits than its factorization.

1329978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111 (or 94 counting only the distinct ones).

The product of its digits is 27216, while the sum is 39.

The square root of 1329978 is about 1153.2467212180. The cubic root of 1329978 is about 109.9718385209.

The spelling of 1329978 in words is "one million, three hundred twenty-nine thousand, nine hundred seventy-eight".