15172540 has 24 divisors (see below), whose sum is σ = 32542272. Its totient is φ = 5939520.

The previous prime is 15172519. The next prime is 15172541. The reversal of 15172540 is 4527151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15172541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7131 + ... + 9010.

It is an arithmetic number, because the mean of its divisors is an integer number (1355928).

Almost surely, 2^15172540 is an apocalyptic number.

15172540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15172540 is an abundant number, since it is smaller than the sum of its proper divisors (17369732).

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

15172540 is a wasteful number, since it uses less digits than its factorization.

15172540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16197 (or 16195 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 15172540 is about 3895.1944752477. The cubic root of 15172540 is about 247.5632052976.

Adding to 15172540 its reverse (4527151), we get a palindrome (19699691).

It can be divided in two parts, 151 and 72540, that multiplied together give a triangular number (10953540 = T₄₆₈₀).

The spelling of 15172540 in words is "fifteen million, one hundred seventy-two thousand, five hundred forty".