172420140 has 48 divisors (see below), whose sum is σ = 498355200. Its totient is φ = 44495040.

The previous prime is 172420091. The next prime is 172420141. The reversal of 172420140 is 41024271.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (172420141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44490 + ... + 48209.

It is an arithmetic number, because the mean of its divisors is an integer number (10382400).

Almost surely, 2^172420140 is an apocalyptic number.

172420140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172420140 is an abundant number, since it is smaller than the sum of its proper divisors (325935060).

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

172420140 is a wasteful number, since it uses less digits than its factorization.

172420140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92742 (or 92740 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 172420140 is about 13130.8849663684. The cubic root of 172420140 is about 556.5822231183.

The spelling of 172420140 in words is "one hundred seventy-two million, four hundred twenty thousand, one hundred forty".