320187138 has 16 divisors (see below), whose sum is σ = 649394496. Its totient is φ = 105225680.

The previous prime is 320187137. The next prime is 320187149. The reversal of 320187138 is 831781023.

It is a junction number, because it is equal to n+sod(n) for n = 320187099 and 320187108.

It is not an unprimeable number, because it can be changed into a prime (320187137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375381 + ... + 376232.

It is an arithmetic number, because the mean of its divisors is an integer number (40587156).

Almost surely, 2^320187138 is an apocalyptic number.

320187138 is an abundant number, since it is smaller than the sum of its proper divisors (329207358).

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

320187138 is a wasteful number, since it uses less digits than its factorization.

320187138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751689.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 320187138 is about 17893.7737216050. The cubic root of 320187138 is about 684.1236866371.

The spelling of 320187138 in words is "three hundred twenty million, one hundred eighty-seven thousand, one hundred thirty-eight".