401255309 has 32 divisors (see below), whose sum is σ = 526417920. Its totient is φ = 297139392.

The previous prime is 401255303. The next prime is 401255311. The reversal of 401255309 is 903552104.

It is not a de Polignac number, because 401255309 - 2¹⁶ = 401189773 is a prime.

It is a super-2 number, since 2×401255309² = 322011646001370962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401255303) 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, 96332 + ... + 100410.

It is an arithmetic number, because the mean of its divisors is an integer number (16450560).

Almost surely, 2^401255309 is an apocalyptic number.

It is an amenable number.

401255309 is a deficient number, since it is larger than the sum of its proper divisors (125162611).

401255309 is a wasteful number, since it uses less digits than its factorization.

401255309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4169.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 401255309 is about 20031.3581416738. The cubic root of 401255309 is about 737.5762611554.

The spelling of 401255309 in words is "four hundred one million, two hundred fifty-five thousand, three hundred nine".