129438787 has 2 divisors, whose sum is σ = 129438788. Its totient is φ = 129438786.

The previous prime is 129438769. The next prime is 129438791. The reversal of 129438787 is 787834921.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129438787 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 129438787.

It is not a weakly prime, because it can be changed into another prime (129438487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64719393 + 64719394.

It is an arithmetic number, because the mean of its divisors is an integer number (64719394).

Almost surely, 2^129438787 is an apocalyptic number.

129438787 is a deficient number, since it is larger than the sum of its proper divisors (1).

129438787 is an equidigital number, since it uses as much as digits as its factorization.

129438787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 49.

The square root of 129438787 is about 11377.1168140263. The cubic root of 129438787 is about 505.8496783027.

The spelling of 129438787 in words is "one hundred twenty-nine million, four hundred thirty-eight thousand, seven hundred eighty-seven".