15540428 has 6 divisors (see below), whose sum is σ = 27195756. Its totient is φ = 7770212.

The previous prime is 15540419. The next prime is 15540451. The reversal of 15540428 is 82404551.

It is a self number, because there is not a number n which added to its sum of digits gives 15540428.

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 as a sum of consecutive naturals, namely, 1942550 + ... + 1942557.

It is an arithmetic number, because the mean of its divisors is an integer number (4532626).

Almost surely, 2^15540428 is an apocalyptic number.

It is an amenable number.

15540428 is a deficient number, since it is larger than the sum of its proper divisors (11655328).

15540428 is a wasteful number, since it uses less digits than its factorization.

15540428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3885111 (or 3885109 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 15540428 is about 3942.1349545646. The cubic root of 15540428 is about 249.5481330906.

Adding to 15540428 its reverse (82404551), we get a palindrome (97944979).

The spelling of 15540428 in words is "fifteen million, five hundred forty thousand, four hundred twenty-eight".