401985491 has 8 divisors (see below), whose sum is σ = 404985600. Its totient is φ = 398994120.

The previous prime is 401985487. The next prime is 401985503. The reversal of 401985491 is 194589104.

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 401985491 - 2² = 401985487 is a prime.

It is a super-2 number, since 2×401985491² = 323184669949022162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401985431) 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, 111170 + ... + 114728.

It is an arithmetic number, because the mean of its divisors is an integer number (50623200).

Almost surely, 2^401985491 is an apocalyptic number.

401985491 is a deficient number, since it is larger than the sum of its proper divisors (3000109).

401985491 is a wasteful number, since it uses less digits than its factorization.

401985491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4369.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 401985491 is about 20049.5758309247. The cubic root of 401985491 is about 738.0233900730.

The spelling of 401985491 in words is "four hundred one million, nine hundred eighty-five thousand, four hundred ninety-one".