15123001540 has 48 divisors (see below), whose sum is σ = 32317709760. Its totient is φ = 5942782080.

The previous prime is 15123001511. The next prime is 15123001571. The reversal of 15123001540 is 4510032151.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2369794 + ... + 2376166.

It is an arithmetic number, because the mean of its divisors is an integer number (673285620).

Almost surely, 2^15123001540 is an apocalyptic number.

15123001540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15123001540 is an abundant number, since it is smaller than the sum of its proper divisors (17194708220).

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

15123001540 is a wasteful number, since it uses less digits than its factorization.

15123001540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8452 (or 8450 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

Adding to 15123001540 its reverse (4510032151), we get a palindrome (19633033691).

The spelling of 15123001540 in words is "fifteen billion, one hundred twenty-three million, one thousand, five hundred forty".