1645352444 has 6 divisors (see below), whose sum is σ = 2879366784. Its totient is φ = 822676220.

The previous prime is 1645352441. The next prime is 1645352461. The reversal of 1645352444 is 4442535461.

It is a junction number, because it is equal to n+sod(n) for n = 1645352398 and 1645352407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645352441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205669052 + ... + 205669059.

It is an arithmetic number, because the mean of its divisors is an integer number (479894464).

Almost surely, 2^1645352444 is an apocalyptic number.

It is an amenable number.

1645352444 is a deficient number, since it is larger than the sum of its proper divisors (1234014340).

1645352444 is a wasteful number, since it uses less digits than its factorization.

1645352444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411338115 (or 411338113 counting only the distinct ones).

The product of its digits is 230400, while the sum is 38.

The square root of 1645352444 is about 40562.9442225290. The cubic root of 1645352444 is about 1180.5552409445. Note that the first 3 decimals are identical.

The spelling of 1645352444 in words is "one billion, six hundred forty-five million, three hundred fifty-two thousand, four hundred forty-four".