138402115 has 4 divisors (see below), whose sum is σ = 166082544. Its totient is φ = 110721688.

The previous prime is 138402113. The next prime is 138402179. The reversal of 138402115 is 511204831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 511204831 = 23 ⋅22226297.

It is a cyclic number.

It is not a de Polignac number, because 138402115 - 2¹ = 138402113 is a prime.

It is a super-3 number, since 3×138402115³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138402115.

It is not an unprimeable number, because it can be changed into a prime (138402113) 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, 13840207 + ... + 13840216.

It is an arithmetic number, because the mean of its divisors is an integer number (41520636).

Almost surely, 2^138402115 is an apocalyptic number.

138402115 is a deficient number, since it is larger than the sum of its proper divisors (27680429).

138402115 is an equidigital number, since it uses as much as digits as its factorization.

138402115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27680428.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 138402115 is about 11764.4428257355. The cubic root of 138402115 is about 517.2663682811.

Adding to 138402115 its reverse (511204831), we get a palindrome (649606946).

The spelling of 138402115 in words is "one hundred thirty-eight million, four hundred two thousand, one hundred fifteen".