15042440 has 64 divisors (see below), whose sum is σ = 39951360. Its totient is φ = 4988160.

The previous prime is 15042427. The next prime is 15042451. The reversal of 15042440 is 4424051.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7814 + ... + 9546.

It is an arithmetic number, because the mean of its divisors is an integer number (624240).

Almost surely, 2^15042440 is an apocalyptic number.

15042440 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 15042440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19975680).

15042440 is an abundant number, since it is smaller than the sum of its proper divisors (24908920).

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

15042440 is a wasteful number, since it uses less digits than its factorization.

15042440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782 (or 1778 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 15042440 is about 3878.4584566552. The cubic root of 15042440 is about 246.8535796188.

Adding to 15042440 its reverse (4424051), we get a palindrome (19466491).

The spelling of 15042440 in words is "fifteen million, forty-two thousand, four hundred forty".