15242440 has 16 divisors (see below), whose sum is σ = 34295580. Its totient is φ = 6096960.

The previous prime is 15242431. The next prime is 15242441. The reversal of 15242440 is 4424251.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12974404 + 2268036 = 3602^2 + 1506^2 .

It is not an unprimeable number, because it can be changed into a prime (15242441) 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, 190491 + ... + 190570.

Almost surely, 2^15242440 is an apocalyptic number.

15242440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15242440 is an abundant number, since it is smaller than the sum of its proper divisors (19053140).

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

15242440 is a wasteful number, since it uses less digits than its factorization.

15242440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381072 (or 381068 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 15242440 is about 3904.1567591479. The cubic root of 15242440 is about 247.9427981149.

Adding to 15242440 its reverse (4424251), we get a palindrome (19666691).

The spelling of 15242440 in words is "fifteen million, two hundred forty-two thousand, four hundred forty".