1985478 has 32 divisors (see below), whose sum is σ = 4406400. Its totient is φ = 591360.

The previous prime is 1985471. The next prime is 1985483. The reversal of 1985478 is 8745891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4198 + ... + 4646.

It is an arithmetic number, because the mean of its divisors is an integer number (137700).

2^1985478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1985478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2203200).

1985478 is an abundant number, since it is smaller than the sum of its proper divisors (2420922).

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

1985478 is a wasteful number, since it uses less digits than its factorization.

1985478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532.

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

The square root of 1985478 is about 1409.0699060018. The cubic root of 1985478 is about 125.6864210428.

The spelling of 1985478 in words is "one million, nine hundred eighty-five thousand, four hundred seventy-eight".