15438163840 has 64 divisors (see below), whose sum is σ = 40262047920. Its totient is φ = 5613875200.

The previous prime is 15438163831. The next prime is 15438163843. The reversal of 15438163840 is 4836183451.

15438163840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-3 number, since 3×15438163840³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15438163843) by changing a digit.

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, 1089421 + ... + 1103500.

Almost surely, 2^15438163840 is an apocalyptic number.

15438163840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15438163840 is an abundant number, since it is smaller than the sum of its proper divisors (24823884080).

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

15438163840 is a wasteful number, since it uses less digits than its factorization.

15438163840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2192951 (or 2192939 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 43.

The spelling of 15438163840 in words is "fifteen billion, four hundred thirty-eight million, one hundred sixty-three thousand, eight hundred forty".