1234409639 has 2 divisors, whose sum is σ = 1234409640. Its totient is φ = 1234409638.

The previous prime is 1234409611. The next prime is 1234409641. The reversal of 1234409639 is 9369044321.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1234409639 is a prime.

It is a super-2 number, since 2×1234409639² = 3047534313712220642, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1234409641, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1234409596 and 1234409605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1234409039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 617204819 + 617204820.

It is an arithmetic number, because the mean of its divisors is an integer number (617204820).

Almost surely, 2^1234409639 is an apocalyptic number.

1234409639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1234409639 is an equidigital number, since it uses as much as digits as its factorization.

1234409639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 41.

The square root of 1234409639 is about 35134.1662630551. The cubic root of 1234409639 is about 1072.7201407840.

The spelling of 1234409639 in words is "one billion, two hundred thirty-four million, four hundred nine thousand, six hundred thirty-nine".