320400442 has 8 divisors (see below), whose sum is σ = 501496416. Its totient is φ = 153234972.

The previous prime is 320400433. The next prime is 320400467. The reversal of 320400442 is 244004023.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3482568 + ... + 3482659.

It is an arithmetic number, because the mean of its divisors is an integer number (62687052).

Almost surely, 2^320400442 is an apocalyptic number.

320400442 is a deficient number, since it is larger than the sum of its proper divisors (181095974).

320400442 is a wasteful number, since it uses less digits than its factorization.

320400442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6965252.

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 320400442 is about 17899.7330147687. The cubic root of 320400442 is about 684.2755706541.

Adding to 320400442 its reverse (244004023), we get a palindrome (564404465).

The spelling of 320400442 in words is "three hundred twenty million, four hundred thousand, four hundred forty-two".