167906138 has 4 divisors (see below), whose sum is σ = 251859210. Its totient is φ = 83953068.

The previous prime is 167906131. The next prime is 167906149. The reversal of 167906138 is 831609761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831609761 = 6761 ⋅123001.

It can be written as a sum of positive squares in only one way, i.e., 140730769 + 27175369 = 11863^2 + 5213^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 167906095 and 167906104.

It is not an unprimeable number, because it can be changed into a prime (167906131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41976533 + ... + 41976536.

Almost surely, 2^167906138 is an apocalyptic number.

167906138 is a deficient number, since it is larger than the sum of its proper divisors (83953072).

167906138 is an equidigital number, since it uses as much as digits as its factorization.

167906138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83953071.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 167906138 is about 12957.8600856777. The cubic root of 167906138 is about 551.6820549656.

It can be divided in two parts, 167906 and 138, that multiplied together give a triangular number (23171028 = T₆₈₀₇).

The spelling of 167906138 in words is "one hundred sixty-seven million, nine hundred six thousand, one hundred thirty-eight".