1978305 has 32 divisors (see below), whose sum is σ = 3677184. Its totient is φ = 889536.

The previous prime is 1978297. The next prime is 1978313. The reversal of 1978305 is 5038791.

It is an interprime number because it is at equal distance from previous prime (1978297) and next prime (1978313).

It is not a de Polignac number, because 1978305 - 2³ = 1978297 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8602 + ... + 8828.

It is an arithmetic number, because the mean of its divisors is an integer number (114912).

2^1978305 is an apocalyptic number.

1978305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1978305 is a deficient number, since it is larger than the sum of its proper divisors (1698879).

1978305 is a wasteful number, since it uses less digits than its factorization.

1978305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 1978305 is about 1406.5223069685. The cubic root of 1978305 is about 125.5348812848.

The spelling of 1978305 in words is "one million, nine hundred seventy-eight thousand, three hundred five".