400444407 has 12 divisors (see below), whose sum is σ = 631003464. Its totient is φ = 242693520.

The previous prime is 400444403. The next prime is 400444409. The reversal of 400444407 is 704444004.

It is a happy number.

It is not a de Polignac number, because 400444407 - 2² = 400444403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400444403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2022348 + ... + 2022545.

It is an arithmetic number, because the mean of its divisors is an integer number (52583622).

Almost surely, 2^400444407 is an apocalyptic number.

400444407 is a deficient number, since it is larger than the sum of its proper divisors (230559057).

400444407 is a wasteful number, since it uses less digits than its factorization.

400444407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4044910 (or 4044907 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 27.

The square root of 400444407 is about 20011.1070908133. The cubic root of 400444407 is about 737.0790669676.

The spelling of 400444407 in words is "four hundred million, four hundred forty-four thousand, four hundred seven".