1243801039 has 16 divisors (see below), whose sum is σ = 1467184320. Its totient is φ = 1043320320.

The previous prime is 1243801033. The next prime is 1243801079. The reversal of 1243801039 is 9301083421.

It is a cyclic number.

It is not a de Polignac number, because 1243801039 - 2¹⁷ = 1243669967 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1243801039.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243801033) 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, 90627 + ... + 103444.

It is an arithmetic number, because the mean of its divisors is an integer number (91699020).

Almost surely, 2^1243801039 is an apocalyptic number.

1243801039 is a deficient number, since it is larger than the sum of its proper divisors (223383281).

1243801039 is a wasteful number, since it uses less digits than its factorization.

1243801039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194130.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1243801039 is about 35267.5635534977. The cubic root of 1243801039 is about 1075.4336923976.

The spelling of 1243801039 in words is "one billion, two hundred forty-three million, eight hundred one thousand, thirty-nine".