1604999842 has 4 divisors (see below), whose sum is σ = 2407499766. Its totient is φ = 802499920.

The previous prime is 1604999831. The next prime is 1604999849. The reversal of 1604999842 is 2489994061.

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., 1204159401 + 400840441 = 34701^2 + 20021^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1604999842.

It is not an unprimeable number, because it can be changed into a prime (1604999849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 401249959 + ... + 401249962.

Almost surely, 2^1604999842 is an apocalyptic number.

1604999842 is a deficient number, since it is larger than the sum of its proper divisors (802499924).

1604999842 is an equidigital number, since it uses as much as digits as its factorization.

1604999842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802499923.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The square root of 1604999842 is about 40062.4492760989. The cubic root of 1604999842 is about 1170.8241306836.

The spelling of 1604999842 in words is "one billion, six hundred four million, nine hundred ninety-nine thousand, eight hundred forty-two".