13123001540 has 48 divisors (see below), whose sum is σ = 30071853504. Its totient is φ = 4770691200.

The previous prime is 13123001527. The next prime is 13123001543. The reversal of 13123001540 is 4510032131.

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

It is not an unprimeable number, because it can be changed into a prime (13123001543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1199495 + ... + 1210385.

It is an arithmetic number, because the mean of its divisors is an integer number (626496948).

Almost surely, 2^13123001540 is an apocalyptic number.

13123001540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13123001540 is an abundant number, since it is smaller than the sum of its proper divisors (16948851964).

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

13123001540 is a wasteful number, since it uses less digits than its factorization.

13123001540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16388 (or 16386 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 13123001540 its reverse (4510032131), we get a palindrome (17633033671).

The spelling of 13123001540 in words is "thirteen billion, one hundred twenty-three million, one thousand, five hundred forty".