128387407 has 2 divisors, whose sum is σ = 128387408. Its totient is φ = 128387406.

The previous prime is 128387401. The next prime is 128387411. The reversal of 128387407 is 704783821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128387407 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128387407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128387401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64193703 + 64193704.

It is an arithmetic number, because the mean of its divisors is an integer number (64193704).

Almost surely, 2^128387407 is an apocalyptic number.

128387407 is a deficient number, since it is larger than the sum of its proper divisors (1).

128387407 is an equidigital number, since it uses as much as digits as its factorization.

128387407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 128387407 is about 11330.8166960727. The cubic root of 128387407 is about 504.4763476951.

The spelling of 128387407 in words is "one hundred twenty-eight million, three hundred eighty-seven thousand, four hundred seven".