401876666 has 4 divisors (see below), whose sum is σ = 602815002. Its totient is φ = 200938332.

The previous prime is 401876623. The next prime is 401876669. The reversal of 401876666 is 666678104.

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

It can be written as a sum of positive squares in only one way, i.e., 270109225 + 131767441 = 16435^2 + 11479^2 .

It is not an unprimeable number, because it can be changed into a prime (401876669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100469165 + ... + 100469168.

Almost surely, 2^401876666 is an apocalyptic number.

401876666 is a deficient number, since it is larger than the sum of its proper divisors (200938336).

401876666 is a wasteful number, since it uses less digits than its factorization.

401876666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200938335.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 401876666 is about 20046.8617494111. The cubic root of 401876666 is about 737.9567851449.

The spelling of 401876666 in words is "four hundred one million, eight hundred seventy-six thousand, six hundred sixty-six".