207855138 has 32 divisors (see below), whose sum is σ = 421267392. Its totient is φ = 68364800.

The previous prime is 207855119. The next prime is 207855143. The reversal of 207855138 is 831558702.

It is a junction number, because it is equal to n+sod(n) for n = 207855096 and 207855105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189973 + ... + 191063.

It is an arithmetic number, because the mean of its divisors is an integer number (13164606).

Almost surely, 2^207855138 is an apocalyptic number.

207855138 is an abundant number, since it is smaller than the sum of its proper divisors (213412254).

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

207855138 is a wasteful number, since it uses less digits than its factorization.

207855138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1490.

The product of its (nonzero) digits is 67200, while the sum is 39.

The square root of 207855138 is about 14417.1820408844. The cubic root of 207855138 is about 592.3616326647.

The spelling of 207855138 in words is "two hundred seven million, eight hundred fifty-five thousand, one hundred thirty-eight".