1604922397 has 16 divisors (see below), whose sum is σ = 1780538032. Its totient is φ = 1437004800.

The previous prime is 1604922391. The next prime is 1604922439. The reversal of 1604922397 is 7932294061.

It can be written as a sum of positive squares in 8 ways, for example, as 66243321 + 1538679076 = 8139^2 + 39226^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1604922397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604922391) 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 15 ways as a sum of consecutive naturals, for example, 157147 + ... + 167047.

It is an arithmetic number, because the mean of its divisors is an integer number (111283627).

Almost surely, 2^1604922397 is an apocalyptic number.

It is an amenable number.

1604922397 is a deficient number, since it is larger than the sum of its proper divisors (175615635).

1604922397 is a wasteful number, since it uses less digits than its factorization.

1604922397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10288.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 1604922397 is about 40061.4827109532. The cubic root of 1604922397 is about 1170.8052987123.

The spelling of 1604922397 in words is "one billion, six hundred four million, nine hundred twenty-two thousand, three hundred ninety-seven".