400646109 has 8 divisors (see below), whose sum is σ = 542952352. Its totient is φ = 262718640.

The previous prime is 400646087. The next prime is 400646111. The reversal of 400646109 is 901646004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 400646109 - 2¹² = 400642013 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 (400646159) 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, 1094479 + ... + 1094844.

It is an arithmetic number, because the mean of its divisors is an integer number (67869044).

Almost surely, 2^400646109 is an apocalyptic number.

It is an amenable number.

400646109 is a deficient number, since it is larger than the sum of its proper divisors (142306243).

400646109 is a wasteful number, since it uses less digits than its factorization.

400646109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2189387.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 400646109 is about 20016.1462074996. The cubic root of 400646109 is about 737.2028006369.

The spelling of 400646109 in words is "four hundred million, six hundred forty-six thousand, one hundred nine".