401409621 has 16 divisors (see below), whose sum is σ = 598964800. Its totient is φ = 265678704.

The previous prime is 401409583. The next prime is 401409623. The reversal of 401409621 is 126904104.

It is not a de Polignac number, because 401409621 - 2⁷ = 401409493 is a prime.

It is a super-2 number, since 2×401409621² = 322259367662727282, which contains 22 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401409623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49726 + ... + 57231.

It is an arithmetic number, because the mean of its divisors is an integer number (37435300).

Almost surely, 2^401409621 is an apocalyptic number.

It is an amenable number.

401409621 is a deficient number, since it is larger than the sum of its proper divisors (197555179).

401409621 is a wasteful number, since it uses less digits than its factorization.

401409621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107105 (or 107099 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 401409621 is about 20035.2095322210. The cubic root of 401409621 is about 737.6707997017.

The spelling of 401409621 in words is "four hundred one million, four hundred nine thousand, six hundred twenty-one".