172217440 has 24 divisors (see below), whose sum is σ = 406864080. Its totient is φ = 68886912.

The previous prime is 172217417. The next prime is 172217453. The reversal of 172217440 is 44712271.

It is a junction number, because it is equal to n+sod(n) for n = 172217399 and 172217408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 538020 + ... + 538339.

It is an arithmetic number, because the mean of its divisors is an integer number (16952670).

Almost surely, 2^172217440 is an apocalyptic number.

172217440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172217440 is an abundant number, since it is smaller than the sum of its proper divisors (234646640).

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

172217440 is a wasteful number, since it uses less digits than its factorization.

172217440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076374 (or 1076366 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 172217440 is about 13123.1642525726. The cubic root of 172217440 is about 556.3640284684.

The spelling of 172217440 in words is "one hundred seventy-two million, two hundred seventeen thousand, four hundred forty".