1978963 has 6 divisors (see below), whose sum is σ = 2302116. Its totient is φ = 1696212.

The previous prime is 1978927. The next prime is 1978981. The reversal of 1978963 is 3698791.

It is a de Polignac number, because none of the positive numbers 2^k-1978963 is a prime.

It is a Duffinian number.

1978963 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1978913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20145 + ... + 20242.

It is an arithmetic number, because the mean of its divisors is an integer number (383686).

2^1978963 is an apocalyptic number.

1978963 is a deficient number, since it is larger than the sum of its proper divisors (323153).

1978963 is an equidigital number, since it uses as much as digits as its factorization.

1978963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40401 (or 40394 counting only the distinct ones).

The product of its digits is 81648, while the sum is 43.

The square root of 1978963 is about 1406.7561977827. The cubic root of 1978963 is about 125.5487977092.

The spelling of 1978963 in words is "one million, nine hundred seventy-eight thousand, nine hundred sixty-three".