1978611 has 8 divisors (see below), whose sum is σ = 2648784. Its totient is φ = 1313760.

The previous prime is 1978597. The next prime is 1978631. The reversal of 1978611 is 1168791.

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

It is not a de Polignac number, because 1978611 - 2¹¹ = 1976563 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (1978631) 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, 360 + ... + 2021.

It is an arithmetic number, because the mean of its divisors is an integer number (331098).

2^1978611 is an apocalyptic number.

1978611 is a deficient number, since it is larger than the sum of its proper divisors (670173).

1978611 is a wasteful number, since it uses less digits than its factorization.

1978611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2661.

The product of its digits is 3024, while the sum is 33.

The square root of 1978611 is about 1406.6310816984. The cubic root of 1978611 is about 125.5413534404.

The spelling of 1978611 in words is "one million, nine hundred seventy-eight thousand, six hundred eleven".