3865245381 has 24 divisors (see below), whose sum is σ = 5871790080. Its totient is φ = 2445369696.

The previous prime is 3865245379. The next prime is 3865245383. The reversal of 3865245381 is 1835425683.

3865245381 is a `hidden beast` number, since 38 + 65 + 24 + 538 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (3865245379) and next prime (3865245383).

It is not a de Polignac number, because 3865245381 - 2¹ = 3865245379 is a prime.

It is a super-2 number, since 2×3865245381² = 29880243710683670322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3865245383) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47226 + ... + 99803.

It is an arithmetic number, because the mean of its divisors is an integer number (244657920).

Almost surely, 2^3865245381 is an apocalyptic number.

It is an amenable number.

3865245381 is a deficient number, since it is larger than the sum of its proper divisors (2006544699).

3865245381 is a wasteful number, since it uses less digits than its factorization.

3865245381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147185 (or 147182 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The square root of 3865245381 is about 62171.0976338684. The cubic root of 3865245381 is about 1569.3712414581.

The spelling of 3865245381 in words is "three billion, eight hundred sixty-five million, two hundred forty-five thousand, three hundred eighty-one".