401220646 has 8 divisors (see below), whose sum is σ = 601932600. Its totient is φ = 200576448.

The previous prime is 401220601. The next prime is 401220647. The reversal of 401220646 is 646022104.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 401220646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401220647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2185 + ... + 28411.

It is an arithmetic number, because the mean of its divisors is an integer number (75241575).

Almost surely, 2^401220646 is an apocalyptic number.

401220646 is a deficient number, since it is larger than the sum of its proper divisors (200711954).

401220646 is a wasteful number, since it uses less digits than its factorization.

401220646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33878.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 401220646 is about 20030.4929045693. The cubic root of 401220646 is about 737.5550216922. Note that the first 3 decimals are identical.

The spelling of 401220646 in words is "four hundred one million, two hundred twenty thousand, six hundred forty-six".