3851720172 has 36 divisors (see below), whose sum is σ = 9747399480. Its totient is φ = 1282442112.

The previous prime is 3851720167. The next prime is 3851720203. The reversal of 3851720172 is 2710271583.

3851720172 is a `hidden beast` number, since 385 + 1 + 7 + 201 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28797 + ... + 92372.

Almost surely, 2^3851720172 is an apocalyptic number.

It is an amenable number.

3851720172 is an abundant number, since it is smaller than the sum of its proper divisors (5895679308).

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

3851720172 is a wasteful number, since it uses less digits than its factorization.

3851720172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122062 (or 122057 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 3851720172 is about 62062.2282229699. The cubic root of 3851720172 is about 1567.5385953883.

The spelling of 3851720172 in words is "three billion, eight hundred fifty-one million, seven hundred twenty thousand, one hundred seventy-two".