15820434141438 has 32 divisors (see below), whose sum is σ = 31757499630720. Its totient is φ = 5254070421600.

The previous prime is 15820434141427. The next prime is 15820434141439. The reversal of 15820434141438 is 83414143402851.

It is a super-2 number, since 2×15820434141438² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15820434141439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1819788 + ... + 5912063.

It is an arithmetic number, because the mean of its divisors is an integer number (992421863460).

Almost surely, 2^{15820434141438} is an apocalyptic number.

15820434141438 is an abundant number, since it is smaller than the sum of its proper divisors (15937065489282).

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

15820434141438 is a wasteful number, since it uses less digits than its factorization.

15820434141438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7733112.

The product of its (nonzero) digits is 1474560, while the sum is 48.

The spelling of 15820434141438 in words is "fifteen trillion, eight hundred twenty billion, four hundred thirty-four million, one hundred forty-one thousand, four hundred thirty-eight".