15400121440 has 48 divisors (see below), whose sum is σ = 39690317520. Its totient is φ = 5600043520.

The previous prime is 15400121423. The next prime is 15400121461. The reversal of 15400121440 is 4412100451.

15400121440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4373275 + ... + 4376794.

It is an arithmetic number, because the mean of its divisors is an integer number (826881615).

Almost surely, 2^15400121440 is an apocalyptic number.

15400121440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15400121440 is an abundant number, since it is smaller than the sum of its proper divisors (24290196080).

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

15400121440 is a wasteful number, since it uses less digits than its factorization.

15400121440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8750095 (or 8750087 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

Adding to 15400121440 its reverse (4412100451), we get a palindrome (19812221891).

The spelling of 15400121440 in words is "fifteen billion, four hundred million, one hundred twenty-one thousand, four hundred forty".