1978308 has 36 divisors (see below), whose sum is σ = 5045040. Its totient is φ = 653616.

The previous prime is 1978297. The next prime is 1978313. The reversal of 1978308 is 8038791.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6291 + ... + 6597.

It is an arithmetic number, because the mean of its divisors is an integer number (140140).

2^1978308 is an apocalyptic number.

1978308 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1978308 is an abundant number, since it is smaller than the sum of its proper divisors (3066732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1978308 is a wasteful number, since it uses less digits than its factorization.

1978308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496 (or 491 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 1978308 is about 1406.5233734283. The cubic root of 1978308 is about 125.5349447406.

The spelling of 1978308 in words is "one million, nine hundred seventy-eight thousand, three hundred eight".