1985454420 has 48 divisors (see below), whose sum is σ = 5578964160. Its totient is φ = 527579136.

The previous prime is 1985454403. The next prime is 1985454421. The reversal of 1985454420 is 244545891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985454421) 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, 41485 + ... + 75444.

It is an arithmetic number, because the mean of its divisors is an integer number (116228420).

Almost surely, 2^1985454420 is an apocalyptic number.

1985454420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1985454420 is an abundant number, since it is smaller than the sum of its proper divisors (3593509740).

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

1985454420 is a wasteful number, since it uses less digits than its factorization.

1985454420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117224 (or 117222 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 42.

The square root of 1985454420 is about 44558.4382580898. The cubic root of 1985454420 is about 1256.8592348045.

The spelling of 1985454420 in words is "one billion, nine hundred eighty-five million, four hundred fifty-four thousand, four hundred twenty".