1243949993 has 16 divisors (see below), whose sum is σ = 1547392896. Its totient is φ = 982467840.

The previous prime is 1243949977. The next prime is 1243950013. The reversal of 1243949993 is 3999493421.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1243949993 - 2⁴ = 1243949977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1243949933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 253421 + ... + 258282.

It is an arithmetic number, because the mean of its divisors is an integer number (96712056).

Almost surely, 2^1243949993 is an apocalyptic number.

1243949993 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1243949993 is a deficient number, since it is larger than the sum of its proper divisors (303442903).

1243949993 is a wasteful number, since it uses less digits than its factorization.

1243949993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511744.

The product of its digits is 1889568, while the sum is 53.

The square root of 1243949993 is about 35269.6752607676. The cubic root of 1243949993 is about 1075.4766209559.

The spelling of 1243949993 in words is "one billion, two hundred forty-three million, nine hundred forty-nine thousand, nine hundred ninety-three".