387908042865 has 32 divisors (see below), whose sum is σ = 709586042880. Its totient is φ = 177262271424.

The previous prime is 387908042843. The next prime is 387908042887. The reversal of 387908042865 is 568240809783.

It is an interprime number because it is at equal distance from previous prime (387908042843) and next prime (387908042887).

It is not a de Polignac number, because 387908042865 - 2¹⁸ = 387907780721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 387908042799 and 387908042808.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 419905 + ... + 975774.

It is an arithmetic number, because the mean of its divisors is an integer number (22174563840).

Almost surely, 2^387908042865 is an apocalyptic number.

387908042865 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

387908042865 is a deficient number, since it is larger than the sum of its proper divisors (321678000015).

387908042865 is a wasteful number, since it uses less digits than its factorization.

387908042865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398341.

The product of its (nonzero) digits is 23224320, while the sum is 60.

The spelling of 387908042865 in words is "three hundred eighty-seven billion, nine hundred eight million, forty-two thousand, eight hundred sixty-five".