1645743094 has 4 divisors (see below), whose sum is σ = 2468614644. Its totient is φ = 822871546.

The previous prime is 1645743067. The next prime is 1645743161. The reversal of 1645743094 is 4903475461.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1645743094.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411435772 + ... + 411435775.

It is an arithmetic number, because the mean of its divisors is an integer number (617153661).

Almost surely, 2^1645743094 is an apocalyptic number.

1645743094 is a deficient number, since it is larger than the sum of its proper divisors (822871550).

1645743094 is an equidigital number, since it uses as much as digits as its factorization.

1645743094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822871549.

The product of its (nonzero) digits is 362880, while the sum is 43.

The square root of 1645743094 is about 40567.7592923247. The cubic root of 1645743094 is about 1180.6486651857.

The spelling of 1645743094 in words is "one billion, six hundred forty-five million, seven hundred forty-three thousand, ninety-four".