1978320 has 40 divisors (see below), whose sum is σ = 6133536. Its totient is φ = 527488.

The previous prime is 1978313. The next prime is 1978343. The reversal of 1978320 is 238791.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3882 + ... + 4361.

2^1978320 is an apocalyptic number.

1978320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1978320 is an abundant number, since it is smaller than the sum of its proper divisors (4155216).

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

1978320 is a wasteful number, since it uses less digits than its factorization.

1978320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8259 (or 8253 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 1978320 is about 1406.5276392592. The cubic root of 1978320 is about 125.5351985629.

The spelling of 1978320 in words is "one million, nine hundred seventy-eight thousand, three hundred twenty".