3781955920 has 40 divisors (see below), whose sum is σ = 8798265000. Its totient is φ = 1511884800.

The previous prime is 3781955899. The next prime is 3781955923. The reversal of 3781955920 is 295591873.

It can be written as a sum of positive squares in 4 ways, for example, as 243609664 + 3538346256 = 15608^2 + 59484^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3781955923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130956 + ... + 157204.

It is an arithmetic number, because the mean of its divisors is an integer number (219956625).

Almost surely, 2^3781955920 is an apocalyptic number.

It is an amenable number.

3781955920 is an abundant number, since it is smaller than the sum of its proper divisors (5016309080).

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

3781955920 is a wasteful number, since it uses less digits than its factorization.

3781955920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28063 (or 28057 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 49.

The square root of 3781955920 is about 61497.6090592147. The cubic root of 3781955920 is about 1558.0168642020.

It can be divided in two parts, 37819 and 55920, that added together give a palindrome (93739).

The spelling of 3781955920 in words is "three billion, seven hundred eighty-one million, nine hundred fifty-five thousand, nine hundred twenty".