401780167 has 4 divisors (see below), whose sum is σ = 404245240. Its totient is φ = 399315096.

The previous prime is 401780161. The next prime is 401780177. The reversal of 401780167 is 761087104.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401780167 is a prime.

It is a super-2 number, since 2×401780167² = 322854605189095778, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401780161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1232292 + ... + 1232617.

It is an arithmetic number, because the mean of its divisors is an integer number (101061310).

Almost surely, 2^401780167 is an apocalyptic number.

401780167 is a deficient number, since it is larger than the sum of its proper divisors (2465073).

401780167 is a wasteful number, since it uses less digits than its factorization.

401780167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2465072.

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 401780167 is about 20044.4547693371. The cubic root of 401780167 is about 737.8977141260.

The spelling of 401780167 in words is "four hundred one million, seven hundred eighty thousand, one hundred sixty-seven".