38128505 has 4 divisors (see below), whose sum is σ = 45754212. Its totient is φ = 30502800.

The previous prime is 38128499. The next prime is 38128507. The reversal of 38128505 is 50582183.

It is a happy number.

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 8404201 + 29724304 = 2899^2 + 5452^2 .

It is not a de Polignac number, because 38128505 - 2⁸ = 38128249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (38128507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3812846 + ... + 3812855.

It is an arithmetic number, because the mean of its divisors is an integer number (11438553).

Almost surely, 2^38128505 is an apocalyptic number.

It is an amenable number.

38128505 is a deficient number, since it is larger than the sum of its proper divisors (7625707).

38128505 is an equidigital number, since it uses as much as digits as its factorization.

38128505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7625706.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 38128505 is about 6174.8283376949. The cubic root of 38128505 is about 336.5760885410.

The spelling of 38128505 in words is "thirty-eight million, one hundred twenty-eight thousand, five hundred five".