138619429 has 4 divisors (see below), whose sum is σ = 149282476. Its totient is φ = 127956384.

The previous prime is 138619399. The next prime is 138619441. The reversal of 138619429 is 924916831.

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 2 ways, for example, as 75655204 + 62964225 = 8698^2 + 7935^2 .

It is a cyclic number.

It is not a de Polignac number, because 138619429 - 2²⁷ = 4401701 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 (138619489) 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, 5331504 + ... + 5331529.

It is an arithmetic number, because the mean of its divisors is an integer number (37320619).

Almost surely, 2^138619429 is an apocalyptic number.

It is an amenable number.

138619429 is a deficient number, since it is larger than the sum of its proper divisors (10663047).

138619429 is a wasteful number, since it uses less digits than its factorization.

138619429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10663046.

The product of its digits is 93312, while the sum is 43.

The square root of 138619429 is about 11773.6752545669. The cubic root of 138619429 is about 517.5369576941.

The spelling of 138619429 in words is "one hundred thirty-eight million, six hundred nineteen thousand, four hundred twenty-nine".