400321663 has 8 divisors (see below), whose sum is σ = 468669600. Its totient is φ = 334763520.

The previous prime is 400321639. The next prime is 400321703. The reversal of 400321663 is 366123004.

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

It is a de Polignac number, because none of the positive numbers 2^k-400321663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400321633) 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, 697138 + ... + 697711.

It is an arithmetic number, because the mean of its divisors is an integer number (58583700).

Almost surely, 2^400321663 is an apocalyptic number.

400321663 is a deficient number, since it is larger than the sum of its proper divisors (68347937).

400321663 is a wasteful number, since it uses less digits than its factorization.

400321663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1394897.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 400321663 is about 20008.0399589765. The cubic root of 400321663 is about 737.0037495813.

Adding to 400321663 its reverse (366123004), we get a palindrome (766444667).

The spelling of 400321663 in words is "four hundred million, three hundred twenty-one thousand, six hundred sixty-three".