15243440 has 20 divisors (see below), whose sum is σ = 35441184. Its totient is φ = 6097344.

The previous prime is 15243439. The next prime is 15243443. The reversal of 15243440 is 4434251.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (15243443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95192 + ... + 95351.

Almost surely, 2^15243440 is an apocalyptic number.

15243440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15243440 is an abundant number, since it is smaller than the sum of its proper divisors (20197744).

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

15243440 is a wasteful number, since it uses less digits than its factorization.

15243440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190556 (or 190550 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 15243440 is about 3904.2848256755. The cubic root of 15243440 is about 247.9482201990.

Adding to 15243440 its reverse (4434251), we get a palindrome (19677691).

The spelling of 15243440 in words is "fifteen million, two hundred forty-three thousand, four hundred forty".