1985458538 has 24 divisors (see below), whose sum is σ = 3548927844. Its totient is φ = 830155200.

The previous prime is 1985458529. The next prime is 1985458549. The reversal of 1985458538 is 8358545891.

It can be written as a sum of positive squares in 2 ways, for example, as 1508778649 + 476679889 = 38843^2 + 21833^2 .

It is a super-3 number, since 3×1985458538³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 243053 + ... + 251088.

Almost surely, 2^1985458538 is an apocalyptic number.

1985458538 is a deficient number, since it is larger than the sum of its proper divisors (1563469306).

1985458538 is a wasteful number, since it uses less digits than its factorization.

1985458538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494198 (or 494191 counting only the distinct ones).

The product of its digits is 6912000, while the sum is 56.

The square root of 1985458538 is about 44558.4844670462. The cubic root of 1985458538 is about 1256.8601037480.

The spelling of 1985458538 in words is "one billion, nine hundred eighty-five million, four hundred fifty-eight thousand, five hundred thirty-eight".