1985429628 has 108 divisors (see below), whose sum is σ = 6287266440. Its totient is φ = 523623744.

The previous prime is 1985429617. The next prime is 1985429653. The reversal of 1985429628 is 8269245891.

It is a happy number.

1985429628 is a `hidden beast` number, since 1 + 9 + 8 + 5 + 4 + 2 + 9 + 628 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 20358 + ... + 66221.

It is an arithmetic number, because the mean of its divisors is an integer number (58215430).

Almost surely, 2^1985429628 is an apocalyptic number.

1985429628 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1985429628 is an abundant number, since it is smaller than the sum of its proper divisors (4301836812).

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

1985429628 is a wasteful number, since it uses less digits than its factorization.

1985429628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86616 (or 86604 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 54.

The square root of 1985429628 is about 44558.1600607565. The cubic root of 1985429628 is about 1256.8540033936.

The spelling of 1985429628 in words is "one billion, nine hundred eighty-five million, four hundred twenty-nine thousand, six hundred twenty-eight".