3857891040 has 72 divisors (see below), whose sum is σ = 13165058088. Its totient is φ = 1028770560.

The previous prime is 3857891029. The next prime is 3857891047. The reversal of 3857891040 is 401987583.

3857891040 is a `hidden beast` number, since 38 + 578 + 9 + 1 + 0 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3857891047) 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 11 ways as a sum of consecutive naturals, for example, 1338106 + ... + 1340985.

It is an arithmetic number, because the mean of its divisors is an integer number (182848029).

Almost surely, 2^3857891040 is an apocalyptic number.

3857891040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3857891040 is an abundant number, since it is smaller than the sum of its proper divisors (9307167048).

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

3857891040 is a wasteful number, since it uses less digits than its factorization.

3857891040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2679112 (or 2679101 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 3857891040 is about 62111.9234929977. The cubic root of 3857891040 is about 1568.3752702722.

The spelling of 3857891040 in words is "three billion, eight hundred fifty-seven million, eight hundred ninety-one thousand, forty".