3172128 has 48 divisors (see below), whose sum is σ = 8418816. Its totient is φ = 1045760.

The previous prime is 3172123. The next prime is 3172133. The reversal of 3172128 is 8212713.

It is an interprime number because it is at equal distance from previous prime (3172123) and next prime (3172133).

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 3172098 and 3172107.

It is not an unprimeable number, because it can be changed into a prime (3172123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16513 + ... + 16703.

It is an arithmetic number, because the mean of its divisors is an integer number (175392).

Almost surely, 2^3172128 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 3172128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4209408).

3172128 is an abundant number, since it is smaller than the sum of its proper divisors (5246688).

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

3172128 is a wasteful number, since it uses less digits than its factorization.

3172128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377 (or 369 counting only the distinct ones).

The product of its digits is 672, while the sum is 24.

The square root of 3172128 is about 1781.0468831561. The cubic root of 3172128 is about 146.9321728830.

The spelling of 3172128 in words is "three million, one hundred seventy-two thousand, one hundred twenty-eight".