1643746474 has 8 divisors (see below), whose sum is σ = 2572820640. Its totient is φ = 786139596.

The previous prime is 1643746393. The next prime is 1643746483. The reversal of 1643746474 is 4746473461.

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

It is a Harshad number since it is a multiple of its sum of digits (46), and also a Moran number because the ratio is a prime number: 35733619 = 1643746474 / (1 + 6 + 4 + 3 + 7 + 4 + 6 + 4 + 7 + 4).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17866764 + ... + 17866855.

It is an arithmetic number, because the mean of its divisors is an integer number (321602580).

Almost surely, 2^1643746474 is an apocalyptic number.

1643746474 is a deficient number, since it is larger than the sum of its proper divisors (929074166).

1643746474 is a wasteful number, since it uses less digits than its factorization.

1643746474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35733644.

The product of its digits is 1354752, while the sum is 46.

The square root of 1643746474 is about 40543.1433660490. The cubic root of 1643746474 is about 1180.1710165809.

The spelling of 1643746474 in words is "one billion, six hundred forty-three million, seven hundred forty-six thousand, four hundred seventy-four".