172261540 has 24 divisors (see below), whose sum is σ = 394636032. Its totient is φ = 62640480.

The previous prime is 172261519. The next prime is 172261553. The reversal of 172261540 is 45162271.

It is a super-3 number, since 3×172261540³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 172261499 and 172261508.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 391284 + ... + 391723.

It is an arithmetic number, because the mean of its divisors is an integer number (16443168).

Almost surely, 2^172261540 is an apocalyptic number.

172261540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172261540 is an abundant number, since it is smaller than the sum of its proper divisors (222374492).

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

172261540 is a wasteful number, since it uses less digits than its factorization.

172261540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783027 (or 783025 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 172261540 is about 13124.8443800298. The cubic root of 172261540 is about 556.4115140960.

The spelling of 172261540 in words is "one hundred seventy-two million, two hundred sixty-one thousand, five hundred forty".