172492740 has 360 divisors, whose sum is σ = 656980632. Its totient is φ = 37739520.

The previous prime is 172492739. The next prime is 172492741. The reversal of 172492740 is 47294271.

It is an interprime number because it is at equal distance from previous prime (172492739) and next prime (172492741).

It can be written as a sum of positive squares in 4 ways, for example, as 4064256 + 168428484 = 2016^2 + 12978^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 172492695 and 172492704.

It is not an unprimeable number, because it can be changed into a prime (172492741) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 3254554 + ... + 3254606.

Almost surely, 2^172492740 is an apocalyptic number.

172492740 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 172492740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (328490316).

172492740 is an abundant number, since it is smaller than the sum of its proper divisors (484487892).

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

172492740 is a wasteful number, since it uses less digits than its factorization.

172492740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 172492740 is about 13133.6491501791. The cubic root of 172492740 is about 556.6603311616.

The spelling of 172492740 in words is "one hundred seventy-two million, four hundred ninety-two thousand, seven hundred forty".