38235781 has 4 divisors (see below), whose sum is σ = 38249932. Its totient is φ = 38221632.

The previous prime is 38235779. The next prime is 38235787. The reversal of 38235781 is 18753283.

38235781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 302500 + 37933281 = 550^2 + 6159^2 .

It is a cyclic number.

It is not a de Polignac number, because 38235781 - 2¹ = 38235779 is a prime.

It is a super-2 number, since 2×38235781² = 2923949897359922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38235781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38235787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1620 + ... + 8893.

It is an arithmetic number, because the mean of its divisors is an integer number (9562483).

Almost surely, 2^38235781 is an apocalyptic number.

It is an amenable number.

38235781 is a deficient number, since it is larger than the sum of its proper divisors (14151).

38235781 is a wasteful number, since it uses less digits than its factorization.

38235781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14150.

The product of its digits is 40320, while the sum is 37.

The square root of 38235781 is about 6183.5087935573. The cubic root of 38235781 is about 336.8914495107.

It can be divided in two parts, 3823 and 5781, that added together give a square (9604 = 98²).

The spelling of 38235781 in words is "thirty-eight million, two hundred thirty-five thousand, seven hundred eighty-one".