400470721 has 8 divisors (see below), whose sum is σ = 470050880. Its totient is φ = 333983088.

The previous prime is 400470709. The next prime is 400470761. The reversal of 400470721 is 127074004.

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 400470721 - 2⁵ = 400470689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400470761) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 772851 + ... + 773368.

It is an arithmetic number, because the mean of its divisors is an integer number (58756360).

Almost surely, 2^400470721 is an apocalyptic number.

It is an amenable number.

400470721 is a deficient number, since it is larger than the sum of its proper divisors (69580159).

400470721 is a wasteful number, since it uses less digits than its factorization.

400470721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546263.

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 400470721 is about 20011.7645648753. The cubic root of 400470721 is about 737.0952115921.

The spelling of 400470721 in words is "four hundred million, four hundred seventy thousand, seven hundred twenty-one".