3865240307481 has 128 divisors (see below), whose sum is σ = 6199123746816. Its totient is φ = 2096609771520.

The previous prime is 3865240307447. The next prime is 3865240307483. The reversal of 3865240307481 is 1847030425683.

It is a happy number.

It is not a de Polignac number, because 3865240307481 - 2¹⁴ = 3865240291097 is a prime.

It is a super-2 number, since 2×3865240307481² (a number of 26 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3865240307483) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3523463725 + ... + 3523464821.

It is an arithmetic number, because the mean of its divisors is an integer number (48430654272).

Almost surely, 2^{3865240307481} is an apocalyptic number.

It is an amenable number.

3865240307481 is a deficient number, since it is larger than the sum of its proper divisors (2333883439335).

3865240307481 is a wasteful number, since it uses less digits than its factorization.

3865240307481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911.

The product of its (nonzero) digits is 3870720, while the sum is 51.

The spelling of 3865240307481 in words is "three trillion, eight hundred sixty-five billion, two hundred forty million, three hundred seven thousand, four hundred eighty-one".