15531242340 has 48 divisors (see below), whose sum is σ = 43557837120. Its totient is φ = 4134963840.

The previous prime is 15531242303. The next prime is 15531242357. The reversal of 15531242340 is 4324213551.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 15531242298 and 15531242307.

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, 171951 + ... + 246230.

It is an arithmetic number, because the mean of its divisors is an integer number (907454940).

Almost surely, 2^15531242340 is an apocalyptic number.

15531242340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15531242340 is an abundant number, since it is smaller than the sum of its proper divisors (28026594780).

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

15531242340 is a wasteful number, since it uses less digits than its factorization.

15531242340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418812 (or 418810 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 15531242340 its reverse (4324213551), we get a palindrome (19855455891).

The spelling of 15531242340 in words is "fifteen billion, five hundred thirty-one million, two hundred forty-two thousand, three hundred forty".