138350421 has 24 divisors (see below), whose sum is σ = 220269504. Its totient is φ = 82978560.

The previous prime is 138350389. The next prime is 138350423. The reversal of 138350421 is 124053831.

It is a happy number.

138350421 is a `hidden beast` number, since 138 + 3 + 504 + 21 = 666.

It is not a de Polignac number, because 138350421 - 2⁵ = 138350389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138350423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2400 + ... + 16806.

It is an arithmetic number, because the mean of its divisors is an integer number (9177896).

Almost surely, 2^138350421 is an apocalyptic number.

138350421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

138350421 is a deficient number, since it is larger than the sum of its proper divisors (81919083).

138350421 is a wasteful number, since it uses less digits than its factorization.

138350421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14521 (or 14518 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 138350421 is about 11762.2455764195. The cubic root of 138350421 is about 517.2019595894.

The spelling of 138350421 in words is "one hundred thirty-eight million, three hundred fifty thousand, four hundred twenty-one".