3938243785 has 32 divisors (see below), whose sum is σ = 5515460352. Its totient is φ = 2643840000.

The previous prime is 3938243717. The next prime is 3938243789. The reversal of 3938243785 is 5873428393.

It is not a de Polignac number, because 3938243785 - 2¹¹ = 3938241737 is a prime.

It is a super-2 number, since 2×3938243785² = 31019528220182252450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3938243789) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 344410 + ... + 355660.

It is an arithmetic number, because the mean of its divisors is an integer number (172358136).

Almost surely, 2^3938243785 is an apocalyptic number.

3938243785 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3938243785 is a deficient number, since it is larger than the sum of its proper divisors (1577216567).

3938243785 is a wasteful number, since it uses less digits than its factorization.

3938243785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11473.

The product of its digits is 4354560, while the sum is 52.

The square root of 3938243785 is about 62755.4283309420. The cubic root of 3938243785 is about 1579.1893220118.

The spelling of 3938243785 in words is "three billion, nine hundred thirty-eight million, two hundred forty-three thousand, seven hundred eighty-five".