1978529 has 8 divisors (see below), whose sum is σ = 2359680. Its totient is φ = 1622016.

The previous prime is 1978523. The next prime is 1978531. The reversal of 1978529 is 9258791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1978529 - 2¹² = 1974433 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978523) 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, 5984 + ... + 6305.

It is an arithmetic number, because the mean of its divisors is an integer number (294960).

2^1978529 is an apocalyptic number.

It is an amenable number.

1978529 is a deficient number, since it is larger than the sum of its proper divisors (381151).

1978529 is a wasteful number, since it uses less digits than its factorization.

1978529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12319.

The product of its digits is 45360, while the sum is 41.

The square root of 1978529 is about 1406.6019337396. The cubic root of 1978529 is about 125.5396191374.

The spelling of 1978529 in words is "one million, nine hundred seventy-eight thousand, five hundred twenty-nine".