1438138207 has 4 divisors (see below), whose sum is σ = 1568878056. Its totient is φ = 1307398360.

The previous prime is 1438138187. The next prime is 1438138241. The reversal of 1438138207 is 7028318341.

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 1438138207 - 2²⁷ = 1303920479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1438138277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65369908 + ... + 65369929.

It is an arithmetic number, because the mean of its divisors is an integer number (392219514).

Almost surely, 2^1438138207 is an apocalyptic number.

1438138207 is a deficient number, since it is larger than the sum of its proper divisors (130739849).

1438138207 is a wasteful number, since it uses less digits than its factorization.

1438138207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130739848.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 1438138207 is about 37922.7927109806. The cubic root of 1438138207 is about 1128.7563541292.

The spelling of 1438138207 in words is "one billion, four hundred thirty-eight million, one hundred thirty-eight thousand, two hundred seven".