15242740 has 24 divisors (see below), whose sum is σ = 32245920. Its totient is φ = 6052128.

The previous prime is 15242737. The next prime is 15242749. The reversal of 15242740 is 4724251.

It is a super-2 number, since 2×15242740² = 464682245415200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15242749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39 + ... + 5521.

It is an arithmetic number, because the mean of its divisors is an integer number (1343580).

Almost surely, 2^15242740 is an apocalyptic number.

15242740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15242740 is an abundant number, since it is smaller than the sum of its proper divisors (17003180).

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

15242740 is a wasteful number, since it uses less digits than its factorization.

15242740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5631 (or 5629 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 15242740 is about 3904.1951795473. The cubic root of 15242740 is about 247.9444247650.

Adding to 15242740 its reverse (4724251), we get a palindrome (19966991).

The spelling of 15242740 in words is "fifteen million, two hundred forty-two thousand, seven hundred forty".