172869840 has 480 divisors, whose sum is σ = 721453824. Its totient is φ = 36495360.

The previous prime is 172869799. The next prime is 172869869. The reversal of 172869840 is 48968271.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2368044 + ... + 2368116.

Almost surely, 2^172869840 is an apocalyptic number.

172869840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172869840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (360726912).

172869840 is an abundant number, since it is smaller than the sum of its proper divisors (548583984).

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

172869840 is a wasteful number, since it uses less digits than its factorization.

172869840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 172869840 is about 13147.9975661695. The cubic root of 172869840 is about 557.0656889459.

The spelling of 172869840 in words is "one hundred seventy-two million, eight hundred sixty-nine thousand, eight hundred forty".