401091863 has 16 divisors (see below), whose sum is σ = 435067200. Its totient is φ = 368349696.

The previous prime is 401091839. The next prime is 401091893. The reversal of 401091863 is 368190104.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 401091863 - 2¹⁰ = 401090839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401091833) 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, 178181 + ... + 180417.

It is an arithmetic number, because the mean of its divisors is an integer number (27191700).

Almost surely, 2^401091863 is an apocalyptic number.

401091863 is a deficient number, since it is larger than the sum of its proper divisors (33975337).

401091863 is a wasteful number, since it uses less digits than its factorization.

401091863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2506.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 401091863 is about 20027.2779728050. The cubic root of 401091863 is about 737.4761002693.

The spelling of 401091863 in words is "four hundred one million, ninety-one thousand, eight hundred sixty-three".