1645196438 has 8 divisors (see below), whose sum is σ = 2482059888. Its totient is φ = 817843144.

The previous prime is 1645196431. The next prime is 1645196473. The reversal of 1645196438 is 8346915461.

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

It is a junction number, because it is equal to n+sod(n) for n = 1645196392 and 1645196401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645196431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2377106 + ... + 2377797.

It is an arithmetic number, because the mean of its divisors is an integer number (310257486).

Almost surely, 2^1645196438 is an apocalyptic number.

1645196438 is a deficient number, since it is larger than the sum of its proper divisors (836863450).

1645196438 is a wasteful number, since it uses less digits than its factorization.

1645196438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4755078.

The product of its digits is 622080, while the sum is 47.

The square root of 1645196438 is about 40561.0211656462. The cubic root of 1645196438 is about 1180.5179278604.

The spelling of 1645196438 in words is "one billion, six hundred forty-five million, one hundred ninety-six thousand, four hundred thirty-eight".