2971686438 has 72 divisors (see below), whose sum is σ = 7564246560. Its totient is φ = 840621600.

The previous prime is 2971686401. The next prime is 2971686439. The reversal of 2971686438 is 8346861792.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2971686439) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 72403 + ... + 105761.

It is an arithmetic number, because the mean of its divisors is an integer number (105058980).

Almost surely, 2^2971686438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2971686438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3782123280).

2971686438 is an abundant number, since it is smaller than the sum of its proper divisors (4592560122).

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

2971686438 is a wasteful number, since it uses less digits than its factorization.

2971686438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33482 (or 33472 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The square root of 2971686438 is about 54513.1767373724. The cubic root of 2971686438 is about 1437.6979740744.

The spelling of 2971686438 in words is "two billion, nine hundred seventy-one million, six hundred eighty-six thousand, four hundred thirty-eight".