167979421 has 16 divisors (see below), whose sum is σ = 177496576. Its totient is φ = 158760000.

The previous prime is 167979391. The next prime is 167979451. The reversal of 167979421 is 124979761.

It is an interprime number because it is at equal distance from previous prime (167979391) and next prime (167979451).

It is a 4-Lehmer number, since φ(167979421) divides (167979421-1)⁴.

It is a cyclic number.

It is a Carmichael number.

It is not a de Polignac number, because 167979421 - 2⁷ = 167979293 is a prime.

It is a deceptive number, since it divides R_167979420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (167979451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 398791 + ... + 399211.

It is an arithmetic number, because the mean of its divisors is an integer number (11093536).

It is a Poulet number, since it divides 2^167979420-1.

Almost surely, 2^167979421 is an apocalyptic number.

It is an amenable number.

167979421 is a deficient number, since it is larger than the sum of its proper divisors (9517155).

167979421 is a wasteful number, since it uses less digits than its factorization.

167979421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724.

The product of its digits is 190512, while the sum is 46.

The square root of 167979421 is about 12960.6875203440. The cubic root of 167979421 is about 551.7623042369.

The spelling of 167979421 in words is "one hundred sixty-seven million, nine hundred seventy-nine thousand, four hundred twenty-one".