38172861 has 6 divisors (see below), whose sum is σ = 55138590. Its totient is φ = 25448568.

The previous prime is 38172859. The next prime is 38172899. The reversal of 38172861 is 16827183.

It can be written as a sum of positive squares in only one way, i.e., 25704900 + 12467961 = 5070^2 + 3531^2 .

It is not a de Polignac number, because 38172861 - 2¹ = 38172859 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38172821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2120706 + ... + 2120723.

It is an arithmetic number, because the mean of its divisors is an integer number (9189765).

Almost surely, 2^38172861 is an apocalyptic number.

It is an amenable number.

38172861 is a deficient number, since it is larger than the sum of its proper divisors (16965729).

38172861 is a wasteful number, since it uses less digits than its factorization.

38172861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4241435 (or 4241432 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 38172861 is about 6178.4189725204. The cubic root of 38172861 is about 336.7065542170.

The spelling of 38172861 in words is "thirty-eight million, one hundred seventy-two thousand, eight hundred sixty-one".