400328642 has 16 divisors (see below), whose sum is σ = 695680512. Its totient is φ = 169218720.

The previous prime is 400328611. The next prime is 400328647. The reversal of 400328642 is 246823004.

It is not an unprimeable number, because it can be changed into a prime (400328647) 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, 194834 + ... + 196877.

It is an arithmetic number, because the mean of its divisors is an integer number (43480032).

Almost surely, 2^400328642 is an apocalyptic number.

400328642 is a deficient number, since it is larger than the sum of its proper divisors (295351870).

400328642 is a wasteful number, since it uses less digits than its factorization.

400328642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391793.

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 400328642 is about 20008.2143631060. The cubic root of 400328642 is about 737.0080324033.

The spelling of 400328642 in words is "four hundred million, three hundred twenty-eight thousand, six hundred forty-two".