1620401322 has 16 divisors (see below), whose sum is σ = 3241361952. Its totient is φ = 540040560.

The previous prime is 1620401317. The next prime is 1620401323. The reversal of 1620401322 is 2231040261.

It is not an unprimeable number, because it can be changed into a prime (1620401323) 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, 20773 + ... + 60599.

It is an arithmetic number, because the mean of its divisors is an integer number (202585122).

Almost surely, 2^1620401322 is an apocalyptic number.

1620401322 is an abundant number, since it is smaller than the sum of its proper divisors (1620960630).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1620401322 is a wasteful number, since it uses less digits than its factorization.

1620401322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46613.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1620401322 is about 40254.2087488998. The cubic root of 1620401322 is about 1174.5572672143.

Adding to 1620401322 its reverse (2231040261), we get a palindrome (3851441583).

The spelling of 1620401322 in words is "one billion, six hundred twenty million, four hundred one thousand, three hundred twenty-two".