1620142444 has 6 divisors (see below), whose sum is σ = 2835249284. Its totient is φ = 810071220.

The previous prime is 1620142441. The next prime is 1620142457. The reversal of 1620142444 is 4442410261.

It is not an unprimeable number, because it can be changed into a prime (1620142441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202517802 + ... + 202517809.

Almost surely, 2^1620142444 is an apocalyptic number.

It is an amenable number.

1620142444 is a deficient number, since it is larger than the sum of its proper divisors (1215106840).

1620142444 is a wasteful number, since it uses less digits than its factorization.

1620142444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405035615 (or 405035613 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

The square root of 1620142444 is about 40250.9930809166. The cubic root of 1620142444 is about 1174.4947141447.

The spelling of 1620142444 in words is "one billion, six hundred twenty million, one hundred forty-two thousand, four hundred forty-four".