138840254 has 16 divisors (see below), whose sum is σ = 238163328. Its totient is φ = 59465112.

The previous prime is 138840223. The next prime is 138840257. The reversal of 138840254 is 452048831.

It is a super-2 number, since 2×138840254² = 38553232261569032, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138840257) 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, 39809 + ... + 43155.

It is an arithmetic number, because the mean of its divisors is an integer number (14885208).

Almost surely, 2^138840254 is an apocalyptic number.

138840254 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

138840254 is a deficient number, since it is larger than the sum of its proper divisors (99323074).

138840254 is a wasteful number, since it uses less digits than its factorization.

138840254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6319.

The product of its (nonzero) digits is 30720, while the sum is 35.

The square root of 138840254 is about 11783.0494355239. The cubic root of 138840254 is about 517.8116293055.

The spelling of 138840254 in words is "one hundred thirty-eight million, eight hundred forty thousand, two hundred fifty-four".