1604397249 has 48 divisors (see below), whose sum is σ = 2910544000. Its totient is φ = 846254304.

The previous prime is 1604397241. The next prime is 1604397299. The reversal of 1604397249 is 9427934061.

It is a happy number.

1604397249 is a `hidden beast` number, since 1 + 604 + 39 + 7 + 2 + 4 + 9 = 666.

It is not a de Polignac number, because 1604397249 - 2³ = 1604397241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1604397241) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20142 + ... + 60120.

Almost surely, 2^1604397249 is an apocalyptic number.

It is an amenable number.

1604397249 is a deficient number, since it is larger than the sum of its proper divisors (1306146751).

1604397249 is a wasteful number, since it uses less digits than its factorization.

1604397249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40019 (or 40002 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 1604397249 is about 40054.9278990738. The cubic root of 1604397249 is about 1170.6775847211.

It can be divided in two parts, 160 and 4397249, that added together give a square (4397409 = 2097²).

The spelling of 1604397249 in words is "one billion, six hundred four million, three hundred ninety-seven thousand, two hundred forty-nine".