400161646 has 4 divisors (see below), whose sum is σ = 600242472. Its totient is φ = 200080822.

The previous prime is 400161637. The next prime is 400161649. The reversal of 400161646 is 646161004.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400161649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100040410 + ... + 100040413.

It is an arithmetic number, because the mean of its divisors is an integer number (150060618).

Almost surely, 2^400161646 is an apocalyptic number.

400161646 is a deficient number, since it is larger than the sum of its proper divisors (200080826).

400161646 is a wasteful number, since it uses less digits than its factorization.

400161646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200080825.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 400161646 is about 20004.0407418101. The cubic root of 400161646 is about 736.9055378540.

The spelling of 400161646 in words is "four hundred million, one hundred sixty-one thousand, six hundred forty-six".