138626460 has 144 divisors (see below), whose sum is σ = 483537600. Its totient is φ = 31491072.

The previous prime is 138626443. The next prime is 138626473. The reversal of 138626460 is 64626831.

138626460 = T₂₇₉₇ + T₂₇₉₈ + ... + T₂₈₃₁.

138626460 is a `hidden beast` number, since 1 + 3 + 8 + 6 + 2 + 646 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 338736 + ... + 339144.

It is an arithmetic number, because the mean of its divisors is an integer number (3357900).

Almost surely, 2^138626460 is an apocalyptic number.

138626460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138626460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241768800).

138626460 is an abundant number, since it is smaller than the sum of its proper divisors (344911140).

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

138626460 is a wasteful number, since it uses less digits than its factorization.

138626460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700 (or 695 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 138626460 is about 11773.9738406368. The cubic root of 138626460 is about 517.5457076480.

The spelling of 138626460 in words is "one hundred thirty-eight million, six hundred twenty-six thousand, four hundred sixty".