38145661 has 6 divisors (see below), whose sum is σ = 39876830. Its totient is φ = 36486648.

The previous prime is 38145659. The next prime is 38145677. The reversal of 38145661 is 16654183.

It is a happy number.

38145661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 33860761 + 4284900 = 5819^2 + 2070^2 .

It is not a de Polignac number, because 38145661 - 2¹ = 38145659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38145641) 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 5 ways as a sum of consecutive naturals, for example, 35526 + ... + 36583.

Almost surely, 2^38145661 is an apocalyptic number.

It is an amenable number.

38145661 is a deficient number, since it is larger than the sum of its proper divisors (1731169).

38145661 is an equidigital number, since it uses as much as digits as its factorization.

38145661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72155 (or 72132 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 38145661 is about 6176.2173698794. The cubic root of 38145661 is about 336.6265620082.

The spelling of 38145661 in words is "thirty-eight million, one hundred forty-five thousand, six hundred sixty-one".