1645613446 has 12 divisors (see below), whose sum is σ = 2605175892. Its totient is φ = 779500764.

The previous prime is 1645613423. The next prime is 1645613467. The reversal of 1645613446 is 6443165461.

It is a happy number.

It is a super-2 number, since 2×1645613446² = 5416087227311989832, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1645613399 and 1645613408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1138900 + ... + 1140343.

It is an arithmetic number, because the mean of its divisors is an integer number (217097991).

Almost surely, 2^1645613446 is an apocalyptic number.

1645613446 is a deficient number, since it is larger than the sum of its proper divisors (959562446).

1645613446 is a wasteful number, since it uses less digits than its factorization.

1645613446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2279283 (or 2279264 counting only the distinct ones).

The product of its digits is 207360, while the sum is 40.

The square root of 1645613446 is about 40566.1613416897. The cubic root of 1645613446 is about 1180.6176614082.

The spelling of 1645613446 in words is "one billion, six hundred forty-five million, six hundred thirteen thousand, four hundred forty-six".