387696991 has 16 divisors (see below), whose sum is σ = 430119936. Its totient is φ = 346500000.

The previous prime is 387696983. The next prime is 387696997. The reversal of 387696991 is 199696783.

It is not a de Polignac number, because 387696991 - 2³ = 387696983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387696997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 515866 + ... + 516616.

It is an arithmetic number, because the mean of its divisors is an integer number (26882496).

Almost surely, 2^387696991 is an apocalyptic number.

387696991 is a deficient number, since it is larger than the sum of its proper divisors (42422945).

387696991 is a wasteful number, since it uses less digits than its factorization.

387696991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1494.

The product of its digits is 4408992, while the sum is 58.

The square root of 387696991 is about 19690.0226256853. The cubic root of 387696991 is about 729.1733878557.

The spelling of 387696991 in words is "three hundred eighty-seven million, six hundred ninety-six thousand, nine hundred ninety-one".