38143840 has 48 divisors (see below), whose sum is σ = 102991392. Its totient is φ = 13077504.

The previous prime is 38143823. The next prime is 38143841. The reversal of 38143840 is 4834183.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38143841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15909 + ... + 18148.

It is an arithmetic number, because the mean of its divisors is an integer number (2145654).

Almost surely, 2^38143840 is an apocalyptic number.

It is an amenable number.

38143840 is an abundant number, since it is smaller than the sum of its proper divisors (64847552).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

38143840 is a wasteful number, since it uses less digits than its factorization.

38143840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34079 (or 34071 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 38143840 is about 6176.0699477904. The cubic root of 38143840 is about 336.6212052895.

It can be divided in two parts, 38143 and 840, that added together give a palindrome (38983).

The spelling of 38143840 in words is "thirty-eight million, one hundred forty-three thousand, eight hundred forty".