2138406648 has 48 divisors (see below), whose sum is σ = 6218839080. Its totient is φ = 610972992.

The previous prime is 2138406563. The next prime is 2138406653. The reversal of 2138406648 is 8466048312.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 908011 + ... + 910362.

Almost surely, 2^2138406648 is an apocalyptic number.

2138406648 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2138406648 is an abundant number, since it is smaller than the sum of its proper divisors (4080432432).

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

2138406648 is a wasteful number, since it uses less digits than its factorization.

2138406648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818396 (or 1818385 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 42.

The square root of 2138406648 is about 46242.9091645411. The cubic root of 2138406648 is about 1288.3388364997.

The spelling of 2138406648 in words is "two billion, one hundred thirty-eight million, four hundred six thousand, six hundred forty-eight".