3854531781 has 24 divisors (see below), whose sum is σ = 5816711160. Its totient is φ = 2456496000.

The previous prime is 3854531761. The next prime is 3854531819. The reversal of 3854531781 is 1871354583.

It is a happy number.

3854531781 is a `hidden beast` number, since 3 + 8 + 545 + 31 + 78 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1936880100 + 1917651681 = 44010^2 + 43791^2 .

It is not a de Polignac number, because 3854531781 - 2⁹ = 3854531269 is a prime.

It is a super-2 number, since 2×3854531781² = 29714830501478063922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3854531761) 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, 46750 + ... + 99471.

It is an arithmetic number, because the mean of its divisors is an integer number (242362965).

Almost surely, 2^3854531781 is an apocalyptic number.

It is an amenable number.

3854531781 is a deficient number, since it is larger than the sum of its proper divisors (1962179379).

3854531781 is a wasteful number, since it uses less digits than its factorization.

3854531781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146357 (or 146354 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The square root of 3854531781 is about 62084.8756220064. The cubic root of 3854531781 is about 1567.9199171071.

The spelling of 3854531781 in words is "three billion, eight hundred fifty-four million, five hundred thirty-one thousand, seven hundred eighty-one".