172505440 has 24 divisors (see below), whose sum is σ = 407544480. Its totient is φ = 69002112.

The previous prime is 172505429. The next prime is 172505447. The reversal of 172505440 is 44505271.

It is a junction number, because it is equal to n+sod(n) for n = 172505399 and 172505408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172505447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 538920 + ... + 539239.

It is an arithmetic number, because the mean of its divisors is an integer number (16981020).

Almost surely, 2^172505440 is an apocalyptic number.

172505440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172505440 is an abundant number, since it is smaller than the sum of its proper divisors (235039040).

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

172505440 is a wasteful number, since it uses less digits than its factorization.

172505440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078174 (or 1078166 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 172505440 is about 13134.1326321916. The cubic root of 172505440 is about 556.6739924375.

The spelling of 172505440 in words is "one hundred seventy-two million, five hundred five thousand, four hundred forty".