1645356406 has 8 divisors (see below), whose sum is σ = 2470627224. Its totient is φ = 821814000.

The previous prime is 1645356397. The next prime is 1645356409. The reversal of 1645356406 is 6046535461.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645356409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 429720 + ... + 433531.

It is an arithmetic number, because the mean of its divisors is an integer number (308828403).

Almost surely, 2^1645356406 is an apocalyptic number.

1645356406 is a deficient number, since it is larger than the sum of its proper divisors (825270818).

1645356406 is an equidigital number, since it uses as much as digits as its factorization.

1645356406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864206.

The product of its (nonzero) digits is 259200, while the sum is 40.

The square root of 1645356406 is about 40562.9930601774. The cubic root of 1645356406 is about 1180.5561885340.

The spelling of 1645356406 in words is "one billion, six hundred forty-five million, three hundred fifty-six thousand, four hundred six".