138653421 has 16 divisors (see below), whose sum is σ = 191912448. Its totient is φ = 88948800.

The previous prime is 138653419. The next prime is 138653429. The reversal of 138653421 is 124356831.

It is not a de Polignac number, because 138653421 - 2¹ = 138653419 is a prime.

It is a super-5 number, since 5×138653421⁵ (a number of 42 digits) contains 55555 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138653429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12715 + ... + 20951.

It is an arithmetic number, because the mean of its divisors is an integer number (11994528).

Almost surely, 2^138653421 is an apocalyptic number.

It is an amenable number.

138653421 is a deficient number, since it is larger than the sum of its proper divisors (53259027).

138653421 is a wasteful number, since it uses less digits than its factorization.

138653421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8452.

The product of its digits is 17280, while the sum is 33.

The square root of 138653421 is about 11775.1187255161. The cubic root of 138653421 is about 517.5792573886.

The spelling of 138653421 in words is "one hundred thirty-eight million, six hundred fifty-three thousand, four hundred twenty-one".