138430388 has 24 divisors (see below), whose sum is σ = 259604352. Its totient is φ = 64356224.

The previous prime is 138430379. The next prime is 138430393. The reversal of 138430388 is 883034831.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6620 + ... + 17907.

It is an arithmetic number, because the mean of its divisors is an integer number (10816848).

Almost surely, 2^138430388 is an apocalyptic number.

It is an amenable number.

138430388 is a deficient number, since it is larger than the sum of its proper divisors (121173964).

138430388 is a wasteful number, since it uses less digits than its factorization.

138430388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24631 (or 24629 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 138430388 is about 11765.6443937423. The cubic root of 138430388 is about 517.3015885432.

The spelling of 138430388 in words is "one hundred thirty-eight million, four hundred thirty thousand, three hundred eighty-eight".