1978916 has 12 divisors (see below), whose sum is σ = 3575040. Its totient is φ = 957480.

The previous prime is 1978913. The next prime is 1978927. The reversal of 1978916 is 6198791.

It is a happy number.

It is a super-2 number, since 2×1978916² = 7832217070112, which contains 22 as substring.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7856 + ... + 8103.

It is an arithmetic number, because the mean of its divisors is an integer number (297920).

2^1978916 is an apocalyptic number.

It is an amenable number.

1978916 is a deficient number, since it is larger than the sum of its proper divisors (1596124).

1978916 is a wasteful number, since it uses less digits than its factorization.

1978916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15994 (or 15992 counting only the distinct ones).

The product of its digits is 27216, while the sum is 41.

The square root of 1978916 is about 1406.7394925856. The cubic root of 1978916 is about 125.5478037812.

The spelling of 1978916 in words is "one million, nine hundred seventy-eight thousand, nine hundred sixteen".