401328621 has 32 divisors (see below), whose sum is σ = 627580800. Its totient is φ = 252771840.

The previous prime is 401328619. The next prime is 401328647. The reversal of 401328621 is 126823104.

401328621 is a `hidden beast` number, since 4 + 0 + 1 + 32 + 8 + 621 = 666.

It is not a de Polignac number, because 401328621 - 2¹ = 401328619 is a prime.

It is a super-2 number, since 2×401328621² = 322129324067523282, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401328661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 235645 + ... + 237341.

It is an arithmetic number, because the mean of its divisors is an integer number (19611900).

Almost surely, 2^401328621 is an apocalyptic number.

It is an amenable number.

401328621 is a deficient number, since it is larger than the sum of its proper divisors (226252179).

401328621 is a wasteful number, since it uses less digits than its factorization.

401328621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2186 (or 2180 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 401328621 is about 20033.1879889348. The cubic root of 401328621 is about 737.6211784411.

The spelling of 401328621 in words is "four hundred one million, three hundred twenty-eight thousand, six hundred twenty-one".