3850721787 has 18 divisors (see below), whose sum is σ = 5645215324. Its totient is φ = 2333054240.

The previous prime is 3850721783. The next prime is 3850721851. The reversal of 3850721787 is 7871270583.

It is not a de Polignac number, because 3850721787 - 2² = 3850721783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3850721783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1180663 + ... + 1183919.

Almost surely, 2^3850721787 is an apocalyptic number.

3850721787 is a deficient number, since it is larger than the sum of its proper divisors (1794493537).

3850721787 is an frugal number, since it uses more digits than its factorization.

3850721787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6539 (or 3271 counting only the distinct ones).

The product of its (nonzero) digits is 658560, while the sum is 48.

The square root of 3850721787 is about 62054.1842827702. The cubic root of 3850721787 is about 1567.4031457546.

Multiplying 3850721787 by its sum of digits (48), we get a square (184834645776 = 429924²).

The spelling of 3850721787 in words is "three billion, eight hundred fifty million, seven hundred twenty-one thousand, seven hundred eighty-seven".