401863391 has 8 divisors (see below), whose sum is σ = 430284960. Its totient is φ = 373973248.

The previous prime is 401863361. The next prime is 401863453. The reversal of 401863391 is 193368104.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 401863391 - 2²² = 397669087 is a prime.

It is a super-2 number, since 2×401863391² = 322988370052037762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401863351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131291 + ... + 134316.

It is an arithmetic number, because the mean of its divisors is an integer number (53785620).

Almost surely, 2^401863391 is an apocalyptic number.

401863391 is a deficient number, since it is larger than the sum of its proper divisors (28421569).

401863391 is a wasteful number, since it uses less digits than its factorization.

401863391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265713.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 401863391 is about 20046.5306474711. The cubic root of 401863391 is about 737.9486595307.

The spelling of 401863391 in words is "four hundred one million, eight hundred sixty-three thousand, three hundred ninety-one".