1945555993 has 8 divisors (see below), whose sum is σ = 2040668928. Its totient is φ = 1851320064.

The previous prime is 1945555967. The next prime is 1945556009. The reversal of 1945555993 is 3995555491.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1945555993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1945855993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214705 + ... + 223582.

It is an arithmetic number, because the mean of its divisors is an integer number (255083616).

Almost surely, 2^1945555993 is an apocalyptic number.

It is an amenable number.

1945555993 is a deficient number, since it is larger than the sum of its proper divisors (95112935).

1945555993 is a wasteful number, since it uses less digits than its factorization.

1945555993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438503.

The product of its digits is 5467500, while the sum is 55.

The square root of 1945555993 is about 44108.4571595970. The cubic root of 1945555993 is about 1248.3831881439.

The spelling of 1945555993 in words is "one billion, nine hundred forty-five million, five hundred fifty-five thousand, nine hundred ninety-three".