401311209 has 32 divisors (see below), whose sum is σ = 585020800. Its totient is φ = 243233280.

The previous prime is 401311189. The next prime is 401311219. The reversal of 401311209 is 902113104.

It is not a de Polignac number, because 401311209 - 2¹³ = 401303017 is a prime.

It is a super-2 number, since 2×401311209² = 322101372938083362, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (401311219) 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, 980997 + ... + 981405.

It is an arithmetic number, because the mean of its divisors is an integer number (18281900).

Almost surely, 2^401311209 is an apocalyptic number.

It is an amenable number.

401311209 is a deficient number, since it is larger than the sum of its proper divisors (183709591).

401311209 is a wasteful number, since it uses less digits than its factorization.

401311209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 401311209 is about 20032.7534053609. The cubic root of 401311209 is about 737.6105108360.

The spelling of 401311209 in words is "four hundred one million, three hundred eleven thousand, two hundred nine".