1604367421 has 2 divisors, whose sum is σ = 1604367422. Its totient is φ = 1604367420.

The previous prime is 1604367389. The next prime is 1604367439. The reversal of 1604367421 is 1247634061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1557170521 + 47196900 = 39461^2 + 6870^2 .

It is an emirp because it is prime and its reverse (1247634061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1604367421 - 2⁵ = 1604367389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1604367451) 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, 802183710 + 802183711.

It is an arithmetic number, because the mean of its divisors is an integer number (802183711).

Almost surely, 2^1604367421 is an apocalyptic number.

It is an amenable number.

1604367421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604367421 is an equidigital number, since it uses as much as digits as its factorization.

1604367421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 1604367421 is about 40054.5555586378. Note that the first 5 decimals coincide. The cubic root of 1604367421 is about 1170.6703298288.

The spelling of 1604367421 in words is "one billion, six hundred four million, three hundred sixty-seven thousand, four hundred twenty-one".