15231240 has 96 divisors (see below), whose sum is σ = 51367680. Its totient is φ = 4059072.

The previous prime is 15231173. The next prime is 15231241. The reversal of 15231240 is 4213251.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15231241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8937 + ... + 10503.

It is an arithmetic number, because the mean of its divisors is an integer number (535080).

Almost surely, 2^15231240 is an apocalyptic number.

15231240 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 15231240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25683840).

15231240 is an abundant number, since it is smaller than the sum of its proper divisors (36136440).

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

15231240 is a wasteful number, since it uses less digits than its factorization.

15231240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1593 (or 1577 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 15231240 is about 3902.7221269263. The cubic root of 15231240 is about 247.8820545643.

Adding to 15231240 its reverse (4213251), we get a palindrome (19444491).

The spelling of 15231240 in words is "fifteen million, two hundred thirty-one thousand, two hundred forty".