3500172 has 72 divisors (see below), whose sum is σ = 9916816. Its totient is φ = 1073088.

The previous prime is 3500149. The next prime is 3500177. The reversal of 3500172 is 2710053.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (3500177) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12498 + ... + 12774.

Almost surely, 2^3500172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3500172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4958408).

3500172 is an abundant number, since it is smaller than the sum of its proper divisors (6416644).

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

3500172 is a wasteful number, since it uses less digits than its factorization.

3500172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 3500172 is about 1870.8746617558. The cubic root of 3500172 is about 151.8319356640.

The spelling of 3500172 in words is "three million, five hundred thousand, one hundred seventy-two".