1985543934 has 48 divisors (see below), whose sum is σ = 4621703184. Its totient is φ = 566283520.

The previous prime is 1985543927. The next prime is 1985543939. The reversal of 1985543934 is 4393455891.

It is a super-3 number, since 3×1985543934³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985543939) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68097 + ... + 92780.

It is an arithmetic number, because the mean of its divisors is an integer number (96285483).

Almost surely, 2^1985543934 is an apocalyptic number.

1985543934 is an abundant number, since it is smaller than the sum of its proper divisors (2636159250).

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

1985543934 is a wasteful number, since it uses less digits than its factorization.

1985543934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160921 (or 160910 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 51.

The square root of 1985543934 is about 44559.4427029782. The cubic root of 1985543934 is about 1256.8781229754.

The spelling of 1985543934 in words is "one billion, nine hundred eighty-five million, five hundred forty-three thousand, nine hundred thirty-four".