401621617 has 16 divisors (see below), whose sum is σ = 431263872. Its totient is φ = 372683520.

The previous prime is 401621599. The next prime is 401621641. The reversal of 401621617 is 716126104.

It is not a de Polignac number, because 401621617 - 2¹⁹ = 401097329 is a prime.

It is a super-2 number, since 2×401621617² = 322599846483389378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401621657) 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, 607267 + ... + 607927.

It is an arithmetic number, because the mean of its divisors is an integer number (26953992).

Almost surely, 2^401621617 is an apocalyptic number.

It is an amenable number.

401621617 is a deficient number, since it is larger than the sum of its proper divisors (29642255).

401621617 is a wasteful number, since it uses less digits than its factorization.

401621617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 401621617 is about 20040.4994199246. The cubic root of 401621617 is about 737.8006385900.

The spelling of 401621617 in words is "four hundred one million, six hundred twenty-one thousand, six hundred seventeen".