138491430 has 128 divisors (see below), whose sum is σ = 418037760. Its totient is φ = 28525440.

The previous prime is 138491417. The next prime is 138491447. The reversal of 138491430 is 34194831.

138491430 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 138491391 and 138491400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 385591 + ... + 385949.

It is an arithmetic number, because the mean of its divisors is an integer number (3265920).

Almost surely, 2^138491430 is an apocalyptic number.

138491430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 138491430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (209018880).

138491430 is an abundant number, since it is smaller than the sum of its proper divisors (279546330).

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

138491430 is a wasteful number, since it uses less digits than its factorization.

138491430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 138491430 is about 11768.2381858968. The cubic root of 138491430 is about 517.3776134771.

The spelling of 138491430 in words is "one hundred thirty-eight million, four hundred ninety-one thousand, four hundred thirty".