1980478 has 4 divisors (see below), whose sum is σ = 2970720. Its totient is φ = 990238.

The previous prime is 1980469. The next prime is 1980491. The reversal of 1980478 is 8740891.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495118 + ... + 495121.

It is an arithmetic number, because the mean of its divisors is an integer number (742680).

2^1980478 is an apocalyptic number.

1980478 is a deficient number, since it is larger than the sum of its proper divisors (990242).

1980478 is an equidigital number, since it uses as much as digits as its factorization.

1980478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990241.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 1980478 is about 1407.2945676013. The cubic root of 1980478 is about 125.5808276008.

The spelling of 1980478 in words is "one million, nine hundred eighty thousand, four hundred seventy-eight".