1604367391 has 12 divisors (see below), whose sum is σ = 1847188584. Its totient is φ = 1381748400.

The previous prime is 1604367389. The next prime is 1604367421. The reversal of 1604367391 is 1937634061.

It is not a de Polignac number, because 1604367391 - 2¹ = 1604367389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604367091) 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 in 11 ways as a sum of consecutive naturals, for example, 198040 + ... + 205981.

It is an arithmetic number, because the mean of its divisors is an integer number (153932382).

Almost surely, 2^1604367391 is an apocalyptic number.

1604367391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1604367391 is a deficient number, since it is larger than the sum of its proper divisors (242821193).

1604367391 is a wasteful number, since it uses less digits than its factorization.

1604367391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404070 (or 404051 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 1604367391 is about 40054.5551841485. Note that the first 3 decimals coincide. The cubic root of 1604367391 is about 1170.6703225321.

The spelling of 1604367391 in words is "one billion, six hundred four million, three hundred sixty-seven thousand, three hundred ninety-one".