401065866 has 24 divisors (see below), whose sum is σ = 892463364. Its totient is φ = 130075200.

The previous prime is 401065843. The next prime is 401065867. The reversal of 401065866 is 668560104.

It can be written as a sum of positive squares in 2 ways, for example, as 268009641 + 133056225 = 16371^2 + 11535^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 401065866.

It is not an unprimeable number, because it can be changed into a prime (401065867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 300435 + ... + 301766.

Almost surely, 2^401065866 is an apocalyptic number.

401065866 is an abundant number, since it is smaller than the sum of its proper divisors (491397498).

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

401065866 is a wasteful number, since it uses less digits than its factorization.

401065866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602246 (or 602243 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 401065866 is about 20026.6289225121. The cubic root of 401065866 is about 737.4601666123.

The spelling of 401065866 in words is "four hundred one million, sixty-five thousand, eight hundred sixty-six".