400440061 has 8 divisors (see below), whose sum is σ = 457798400. Its totient is φ = 343119888.

The previous prime is 400440043. The next prime is 400440077. The reversal of 400440061 is 160044004.

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 400440061 - 2²¹ = 398342909 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 (400440041) 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, 18415 + ... + 33763.

It is an arithmetic number, because the mean of its divisors is an integer number (57224800).

Almost surely, 2^400440061 is an apocalyptic number.

It is an amenable number.

400440061 is a deficient number, since it is larger than the sum of its proper divisors (57358339).

400440061 is a wasteful number, since it uses less digits than its factorization.

400440061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19083.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 400440061 is about 20010.9985008245. The cubic root of 400440061 is about 737.0764004658.

Adding to 400440061 its reverse (160044004), we get a palindrome (560484065).

The spelling of 400440061 in words is "four hundred million, four hundred forty thousand, sixty-one".