1623717947 has 4 divisors (see below), whose sum is σ = 1650336336. Its totient is φ = 1597099560.

The previous prime is 1623717943. The next prime is 1623717967. The reversal of 1623717947 is 7497173261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7497173261 = 2029 ⋅3695009.

It is not a de Polignac number, because 1623717947 - 2² = 1623717943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1623717943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13309103 + ... + 13309224.

It is an arithmetic number, because the mean of its divisors is an integer number (412584084).

Almost surely, 2^1623717947 is an apocalyptic number.

1623717947 is a deficient number, since it is larger than the sum of its proper divisors (26618389).

1623717947 is an equidigital number, since it uses as much as digits as its factorization.

1623717947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26618388.

The product of its digits is 444528, while the sum is 47.

The square root of 1623717947 is about 40295.3836934208. The cubic root of 1623717947 is about 1175.3580793664.

The spelling of 1623717947 in words is "one billion, six hundred twenty-three million, seven hundred seventeen thousand, nine hundred forty-seven".