38172905 has 8 divisors (see below), whose sum is σ = 48502152. Its totient is φ = 28741888.

The previous prime is 38172899. The next prime is 38172907. The reversal of 38172905 is 50927183.

38172905 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 4 ways, for example, as 14776336 + 23396569 = 3844^2 + 4837^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38172905 is a prime.

It is a super-2 number, since 2×38172905² = 2914341352278050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38172907) 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 7 ways as a sum of consecutive naturals, for example, 224462 + ... + 224631.

It is an arithmetic number, because the mean of its divisors is an integer number (6062769).

Almost surely, 2^38172905 is an apocalyptic number.

It is an amenable number.

38172905 is a deficient number, since it is larger than the sum of its proper divisors (10329247).

38172905 is a wasteful number, since it uses less digits than its factorization.

38172905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449115.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 38172905 is about 6178.4225333009. The cubic root of 38172905 is about 336.7066835854.

The spelling of 38172905 in words is "thirty-eight million, one hundred seventy-two thousand, nine hundred five".