138387433 has 2 divisors, whose sum is σ = 138387434. Its totient is φ = 138387432.

The previous prime is 138387421. The next prime is 138387439. The reversal of 138387433 is 334783831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118200384 + 20187049 = 10872^2 + 4493^2 .

It is a cyclic number.

It is not a de Polignac number, because 138387433 - 2⁹ = 138386921 is a prime.

It is a super-2 number, since 2×138387433² = 38302163224658978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138387439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69193716 + 69193717.

It is an arithmetic number, because the mean of its divisors is an integer number (69193717).

Almost surely, 2^138387433 is an apocalyptic number.

It is an amenable number.

138387433 is a deficient number, since it is larger than the sum of its proper divisors (1).

138387433 is an equidigital number, since it uses as much as digits as its factorization.

138387433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 40.

The square root of 138387433 is about 11763.8188102334. The cubic root of 138387433 is about 517.2480767172.

The spelling of 138387433 in words is "one hundred thirty-eight million, three hundred eighty-seven thousand, four hundred thirty-three".