2138406472 has 32 divisors (see below), whose sum is σ = 4284343800. Its totient is φ = 997069824.

The previous prime is 2138406451. The next prime is 2138406499. The reversal of 2138406472 is 2746048312.

It can be written as a sum of positive squares in 4 ways, for example, as 2089769796 + 48636676 = 45714^2 + 6974^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57303 + ... + 86950.

Almost surely, 2^2138406472 is an apocalyptic number.

It is an amenable number.

2138406472 is an abundant number, since it is smaller than the sum of its proper divisors (2145937328).

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

2138406472 is a wasteful number, since it uses less digits than its factorization.

2138406472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144385 (or 144381 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 2138406472 is about 46242.9072615466. The cubic root of 2138406472 is about 1288.3388011545.

The spelling of 2138406472 in words is "two billion, one hundred thirty-eight million, four hundred six thousand, four hundred seventy-two".