1985738734 has 32 divisors (see below), whose sum is σ = 3475777536. Its totient is φ = 833245920.

The previous prime is 1985738723. The next prime is 1985738749. The reversal of 1985738734 is 4378375891.

It is a happy number.

It is a super-3 number, since 3×1985738734³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185229 + ... + 195655.

It is an arithmetic number, because the mean of its divisors is an integer number (108618048).

Almost surely, 2^1985738734 is an apocalyptic number.

1985738734 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1985738734 is a deficient number, since it is larger than the sum of its proper divisors (1490038802).

1985738734 is a wasteful number, since it uses less digits than its factorization.

1985738734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10720.

The product of its digits is 5080320, while the sum is 55.

The square root of 1985738734 is about 44561.6284935818. The cubic root of 1985738734 is about 1256.9192253735.

The spelling of 1985738734 in words is "one billion, nine hundred eighty-five million, seven hundred thirty-eight thousand, seven hundred thirty-four".