401263809 has 16 divisors (see below), whose sum is σ = 542169984. Its totient is φ = 263952000.

The previous prime is 401263789. The next prime is 401263829. The reversal of 401263809 is 908362104.

It is an interprime number because it is at equal distance from previous prime (401263789) and next prime (401263829).

It is not a de Polignac number, because 401263809 - 2⁵ = 401263777 is a prime.

It is a super-2 number, since 2×401263809² = 322025288826376962, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 401263809.

It is not an unprimeable number, because it can be changed into a prime (401263829) 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, 92724 + ... + 96954.

It is an arithmetic number, because the mean of its divisors is an integer number (33885624).

Almost surely, 2^401263809 is an apocalyptic number.

It is an amenable number.

401263809 is a deficient number, since it is larger than the sum of its proper divisors (140906175).

401263809 is a wasteful number, since it uses less digits than its factorization.

401263809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4648.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 401263809 is about 20031.5703078915. The cubic root of 401263809 is about 737.5814692725.

The spelling of 401263809 in words is "four hundred one million, two hundred sixty-three thousand, eight hundred nine".