401909445 has 40 divisors (see below), whose sum is σ = 823388544. Its totient is φ = 183728736.

The previous prime is 401909423. The next prime is 401909479. The reversal of 401909445 is 544909104.

It is a happy number.

It is not a de Polignac number, because 401909445 - 2¹² = 401905349 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 68049 + ... + 73718.

Almost surely, 2^401909445 is an apocalyptic number.

401909445 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

401909445 is an abundant number, since it is smaller than the sum of its proper divisors (421479099).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

401909445 is a wasteful number, since it uses less digits than its factorization.

401909445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141791 (or 141782 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 401909445 is about 20047.6792921276. The cubic root of 401909445 is about 737.9768483715.

The spelling of 401909445 in words is "four hundred one million, nine hundred nine thousand, four hundred forty-five".