400646345 has 16 divisors (see below), whose sum is σ = 534382272. Its totient is φ = 285879360.

The previous prime is 400646317. The next prime is 400646347. The reversal of 400646345 is 543646004.

It is a de Polignac number, because none of the positive numbers 2^k-400646345 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400646347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65807 + ... + 71636.

It is an arithmetic number, because the mean of its divisors is an integer number (33398892).

Almost surely, 2^400646345 is an apocalyptic number.

It is an amenable number.

400646345 is a deficient number, since it is larger than the sum of its proper divisors (133735927).

400646345 is a wasteful number, since it uses less digits than its factorization.

400646345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137512.

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 400646345 is about 20016.1521027394. The cubic root of 400646345 is about 737.2029453863.

The spelling of 400646345 in words is "four hundred million, six hundred forty-six thousand, three hundred forty-five".