1978458 has 16 divisors (see below), whose sum is σ = 3979200. Its totient is φ = 655776.

The previous prime is 1978441. The next prime is 1978463. The reversal of 1978458 is 8548791.

It is a Curzon 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, 366 + ... + 2022.

It is an arithmetic number, because the mean of its divisors is an integer number (248700).

2^1978458 is an apocalyptic number.

1978458 is an abundant number, since it is smaller than the sum of its proper divisors (2000742).

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

1978458 is a wasteful number, since it uses less digits than its factorization.

1978458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1861.

The product of its digits is 80640, while the sum is 42.

The square root of 1978458 is about 1406.5766953849. The cubic root of 1978458 is about 125.5381174460.

The spelling of 1978458 in words is "one million, nine hundred seventy-eight thousand, four hundred fifty-eight".