38128907 has 4 divisors (see below), whose sum is σ = 39159456. Its totient is φ = 37098360.

The previous prime is 38128903. The next prime is 38128913. The reversal of 38128907 is 70982183.

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

It is a cyclic number.

It is not a de Polignac number, because 38128907 - 2² = 38128903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38128901) 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, 515219 + ... + 515292.

It is an arithmetic number, because the mean of its divisors is an integer number (9789864).

Almost surely, 2^38128907 is an apocalyptic number.

38128907 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

38128907 is a deficient number, since it is larger than the sum of its proper divisors (1030549).

38128907 is a wasteful number, since it uses less digits than its factorization.

38128907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030548.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 38128907 is about 6174.8608891213. The cubic root of 38128907 is about 336.5772714103.

The spelling of 38128907 in words is "thirty-eight million, one hundred twenty-eight thousand, nine hundred seven".