138409343 has 8 divisors (see below), whose sum is σ = 140378880. Its totient is φ = 136445400.

The previous prime is 138409333. The next prime is 138409351. The reversal of 138409343 is 343904831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138409343 - 2¹⁸ = 138147199 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 (138409333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82196 + ... + 83862.

It is an arithmetic number, because the mean of its divisors is an integer number (17547360).

Almost surely, 2^138409343 is an apocalyptic number.

138409343 is a deficient number, since it is larger than the sum of its proper divisors (1969537).

138409343 is a wasteful number, since it uses less digits than its factorization.

138409343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2797.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 138409343 is about 11764.7500185937. The cubic root of 138409343 is about 517.2753728068.

The spelling of 138409343 in words is "one hundred thirty-eight million, four hundred nine thousand, three hundred forty-three".