138403234 has 4 divisors (see below), whose sum is σ = 207604854. Its totient is φ = 69201616.

The previous prime is 138403231. The next prime is 138403253. The reversal of 138403234 is 432304831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 432304831 = 7 ⋅61757833.

It can be written as a sum of positive squares in only one way, i.e., 133980625 + 4422609 = 11575^2 + 2103^2 .

It is not an unprimeable number, because it can be changed into a prime (138403231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34600807 + ... + 34600810.

Almost surely, 2^138403234 is an apocalyptic number.

138403234 is a deficient number, since it is larger than the sum of its proper divisors (69201620).

138403234 is an equidigital number, since it uses as much as digits as its factorization.

138403234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69201619.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 138403234 is about 11764.4903842028. The cubic root of 138403234 is about 517.2677623337.

The spelling of 138403234 in words is "one hundred thirty-eight million, four hundred three thousand, two hundred thirty-four".