15400122420 has 96 divisors (see below), whose sum is σ = 45162270720. Its totient is φ = 3913557120.

The previous prime is 15400122407. The next prime is 15400122427. The reversal of 15400122420 is 2422100451.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15400122427) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 353391 + ... + 394569.

It is an arithmetic number, because the mean of its divisors is an integer number (470440320).

Almost surely, 2^15400122420 is an apocalyptic number.

15400122420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15400122420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22581135360).

15400122420 is an abundant number, since it is smaller than the sum of its proper divisors (29762148300).

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

15400122420 is a wasteful number, since it uses less digits than its factorization.

15400122420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41485 (or 41483 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

Adding to 15400122420 its reverse (2422100451), we get a palindrome (17822222871).

The spelling of 15400122420 in words is "fifteen billion, four hundred million, one hundred twenty-two thousand, four hundred twenty".