138428310 has 32 divisors (see below), whose sum is σ = 343686240. Its totient is φ = 35641088.

The previous prime is 138428249. The next prime is 138428317. The reversal of 138428310 is 13824831.

It is a super-2 number, since 2×138428310² = 38324794018912200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138428317) 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, 78687 + ... + 80426.

It is an arithmetic number, because the mean of its divisors is an integer number (10740195).

Almost surely, 2^138428310 is an apocalyptic number.

138428310 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138428310 is an abundant number, since it is smaller than the sum of its proper divisors (205257930).

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

138428310 is a wasteful number, since it uses less digits than its factorization.

138428310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159152.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 138428310 is about 11765.5560854555. The cubic root of 138428310 is about 517.2990000988.

The spelling of 138428310 in words is "one hundred thirty-eight million, four hundred twenty-eight thousand, three hundred ten".