400456661 has 8 divisors (see below), whose sum is σ = 448669344. Its totient is φ = 354211920.

The previous prime is 400456627. The next prime is 400456663. The reversal of 400456661 is 166654004.

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 400456661 - 2¹⁰ = 400455637 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 (400456663) 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, 491555 + ... + 492368.

It is an arithmetic number, because the mean of its divisors is an integer number (56083668).

Almost surely, 2^400456661 is an apocalyptic number.

It is an amenable number.

400456661 is a deficient number, since it is larger than the sum of its proper divisors (48212683).

400456661 is a wasteful number, since it uses less digits than its factorization.

400456661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983971.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 400456661 is about 20011.4132684326. The cubic root of 400456661 is about 737.0865853436.

The spelling of 400456661 in words is "four hundred million, four hundred fifty-six thousand, six hundred sixty-one".