15212425440 has 48 divisors (see below), whose sum is σ = 47919141648. Its totient is φ = 4056646656.

The previous prime is 15212425427. The next prime is 15212425457. The reversal of 15212425440 is 4452421251.

It is a tau number, because it is divible by the number of its divisors (48).

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 = 15212425398 and 15212425407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15845797 + ... + 15846756.

It is an arithmetic number, because the mean of its divisors is an integer number (998315451).

Almost surely, 2^15212425440 is an apocalyptic number.

15212425440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15212425440 is an abundant number, since it is smaller than the sum of its proper divisors (32706716208).

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

15212425440 is a wasteful number, since it uses less digits than its factorization.

15212425440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31692571 (or 31692563 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

Adding to 15212425440 its reverse (4452421251), we get a palindrome (19664846691).

The spelling of 15212425440 in words is "fifteen billion, two hundred twelve million, four hundred twenty-five thousand, four hundred forty".