207258138 has 24 divisors (see below), whose sum is σ = 454472928. Its totient is φ = 68253192.

The previous prime is 207258131. The next prime is 207258167. The reversal of 207258138 is 831852702.

207258138 is a `hidden beast` number, since 2 + 0 + 72 + 581 + 3 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (207258131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67870 + ... + 70857.

It is an arithmetic number, because the mean of its divisors is an integer number (18936372).

Almost surely, 2^207258138 is an apocalyptic number.

207258138 is an abundant number, since it is smaller than the sum of its proper divisors (247214790).

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

207258138 is a wasteful number, since it uses less digits than its factorization.

207258138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138818 (or 138815 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 207258138 is about 14396.4626905362. The cubic root of 207258138 is about 591.7939632559.

The spelling of 207258138 in words is "two hundred seven million, two hundred fifty-eight thousand, one hundred thirty-eight".