400660709 has 8 divisors (see below), whose sum is σ = 437914368. Its totient is φ = 364927680.

The previous prime is 400660693. The next prime is 400660717. The reversal of 400660709 is 907066004.

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 400660709 - 2⁴ = 400660693 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400663709) 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, 379607 + ... + 380660.

It is an arithmetic number, because the mean of its divisors is an integer number (54739296).

Almost surely, 2^400660709 is an apocalyptic number.

It is an amenable number.

400660709 is a deficient number, since it is larger than the sum of its proper divisors (37253659).

400660709 is a wasteful number, since it uses less digits than its factorization.

400660709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760315.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 400660709 is about 20016.5109097465. The cubic root of 400660709 is about 737.2117553644.

The spelling of 400660709 in words is "four hundred million, six hundred sixty thousand, seven hundred nine".