1243402239 has 16 divisors (see below), whose sum is σ = 1668718080. Its totient is φ = 823529280.

The previous prime is 1243402229. The next prime is 1243402243. The reversal of 1243402239 is 9322043421.

It is not a de Polignac number, because 1243402239 - 2⁹ = 1243401727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243402229) 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, 307372 + ... + 311390.

It is an arithmetic number, because the mean of its divisors is an integer number (104294880).

Almost surely, 2^1243402239 is an apocalyptic number.

1243402239 is a deficient number, since it is larger than the sum of its proper divisors (425315841).

1243402239 is a wasteful number, since it uses less digits than its factorization.

1243402239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4670.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 1243402239 is about 35261.9091797367. The cubic root of 1243402239 is about 1075.3187413219.

The spelling of 1243402239 in words is "one billion, two hundred forty-three million, four hundred two thousand, two hundred thirty-nine".