2138449407 has 4 divisors (see below), whose sum is σ = 2851265880. Its totient is φ = 1425632936.

The previous prime is 2138449387. The next prime is 2138449421. The reversal of 2138449407 is 7049448312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2138449407 - 2¹² = 2138445311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138449427) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 356408232 + ... + 356408237.

It is an arithmetic number, because the mean of its divisors is an integer number (712816470).

Almost surely, 2^2138449407 is an apocalyptic number.

2138449407 is a deficient number, since it is larger than the sum of its proper divisors (712816473).

2138449407 is an equidigital number, since it uses as much as digits as its factorization.

2138449407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712816472.

The product of its (nonzero) digits is 193536, while the sum is 42.

The square root of 2138449407 is about 46243.3714925718. The cubic root of 2138449407 is about 1288.3474235339.

The spelling of 2138449407 in words is "two billion, one hundred thirty-eight million, four hundred forty-nine thousand, four hundred seven".