138869240 has 32 divisors (see below), whose sum is σ = 314059680. Its totient is φ = 55262592.

The previous prime is 138869221. The next prime is 138869267. The reversal of 138869240 is 42968831.

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, 932 + ... + 16691.

It is an arithmetic number, because the mean of its divisors is an integer number (9814365).

Almost surely, 2^138869240 is an apocalyptic number.

138869240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138869240 is an abundant number, since it is smaller than the sum of its proper divisors (175190440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138869240 is a wasteful number, since it uses less digits than its factorization.

138869240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17831 (or 17827 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 138869240 is about 11784.2793585353. The cubic root of 138869240 is about 517.8476617074.

The spelling of 138869240 in words is "one hundred thirty-eight million, eight hundred sixty-nine thousand, two hundred forty".