1645284421 has 8 divisors (see below), whose sum is σ = 1852754688. Its totient is φ = 1447464000.

The previous prime is 1645284391. The next prime is 1645284437. The reversal of 1645284421 is 1244825461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1645284421 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 (1645284451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2412100 + ... + 2412781.

It is an arithmetic number, because the mean of its divisors is an integer number (231594336).

Almost surely, 2^1645284421 is an apocalyptic number.

1645284421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1645284421 is a deficient number, since it is larger than the sum of its proper divisors (207470267).

1645284421 is a wasteful number, since it uses less digits than its factorization.

1645284421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4824923.

The product of its digits is 61440, while the sum is 37.

The square root of 1645284421 is about 40562.1057268974. The cubic root of 1645284421 is about 1180.5389716813.

The spelling of 1645284421 in words is "one billion, six hundred forty-five million, two hundred eighty-four thousand, four hundred twenty-one".