387128723 has 2 divisors, whose sum is σ = 387128724. Its totient is φ = 387128722.

The previous prime is 387128719. The next prime is 387128767. The reversal of 387128723 is 327821783.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 387128723 - 2² = 387128719 is a prime.

It is a super-2 number, since 2×387128723² = 299737296343221458, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (387128123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193564361 + 193564362.

It is an arithmetic number, because the mean of its divisors is an integer number (193564362).

Almost surely, 2^387128723 is an apocalyptic number.

387128723 is a deficient number, since it is larger than the sum of its proper divisors (1).

387128723 is an equidigital number, since it uses as much as digits as its factorization.

387128723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 41.

The square root of 387128723 is about 19675.5869798083. The cubic root of 387128723 is about 728.8169509732.

The spelling of 387128723 in words is "three hundred eighty-seven million, one hundred twenty-eight thousand, seven hundred twenty-three".