1609772642 has 4 divisors (see below), whose sum is σ = 2414658966. Its totient is φ = 804886320.

The previous prime is 1609772641. The next prime is 1609772707. The reversal of 1609772642 is 2462779061.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1423477441 + 186295201 = 37729^2 + 13649^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1609772593 and 1609772602.

It is not an unprimeable number, because it can be changed into a prime (1609772641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402443159 + ... + 402443162.

Almost surely, 2^1609772642 is an apocalyptic number.

1609772642 is a deficient number, since it is larger than the sum of its proper divisors (804886324).

1609772642 is an equidigital number, since it uses as much as digits as its factorization.

1609772642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804886323.

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 1609772642 is about 40121.9720602066. The cubic root of 1609772642 is about 1171.9835450054.

The spelling of 1609772642 in words is "one billion, six hundred nine million, seven hundred seventy-two thousand, six hundred forty-two".