615138 has 8 divisors (see below), whose sum is σ = 1230288. Its totient is φ = 205044.

The previous prime is 615137. The next prime is 615151. The reversal of 615138 is 831516.

It is a sphenic number, since it is the product of 3 distinct primes.

615138 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (615137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51256 + ... + 51267.

It is an arithmetic number, because the mean of its divisors is an integer number (153786).

2⁶¹⁵¹³⁸ is an apocalyptic number.

615138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

615138 is a wasteful number, since it uses less digits than its factorization.

615138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102528.

The product of its digits is 720, while the sum is 24.

The square root of 615138 is about 784.3073377191. The cubic root of 615138 is about 85.0467101974.

The spelling of 615138 in words is "six hundred fifteen thousand, one hundred thirty-eight".