138835402 has 4 divisors (see below), whose sum is σ = 208253106. Its totient is φ = 69417700.

The previous prime is 138835399. The next prime is 138835409. The reversal of 138835402 is 204538831.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 138509361 + 326041 = 11769^2 + 571^2 .

It is not an unprimeable number, because it can be changed into a prime (138835409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34708849 + ... + 34708852.

Almost surely, 2^138835402 is an apocalyptic number.

138835402 is a deficient number, since it is larger than the sum of its proper divisors (69417704).

138835402 is an equidigital number, since it uses as much as digits as its factorization.

138835402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69417703.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 138835402 is about 11782.8435447476. The cubic root of 138835402 is about 517.8055973102.

The spelling of 138835402 in words is "one hundred thirty-eight million, eight hundred thirty-five thousand, four hundred two".