1978613 has 16 divisors (see below), whose sum is σ = 2580480. Its totient is φ = 1472256.

The previous prime is 1978597. The next prime is 1978631. The reversal of 1978613 is 3168791.

It is a cyclic number.

It is not a de Polignac number, because 1978613 - 2⁴ = 1978597 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 908 + ... + 2186.

It is an arithmetic number, because the mean of its divisors is an integer number (161280).

2^1978613 is an apocalyptic number.

1978613 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1978613 is a deficient number, since it is larger than the sum of its proper divisors (601867).

1978613 is a wasteful number, since it uses less digits than its factorization.

1978613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316.

The product of its digits is 9072, while the sum is 35.

The square root of 1978613 is about 1406.6317926167. The cubic root of 1978613 is about 125.5413957399.

The spelling of 1978613 in words is "one million, nine hundred seventy-eight thousand, six hundred thirteen".