388401687 has 24 divisors (see below), whose sum is σ = 567490560. Its totient is φ = 255966480.

The previous prime is 388401653. The next prime is 388401719. The reversal of 388401687 is 786104883.

It is not a de Polignac number, because 388401687 - 2¹² = 388397591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388401647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 478512 + ... + 479322.

It is an arithmetic number, because the mean of its divisors is an integer number (23645440).

Almost surely, 2^388401687 is an apocalyptic number.

388401687 is a deficient number, since it is larger than the sum of its proper divisors (179088873).

388401687 is a wasteful number, since it uses less digits than its factorization.

388401687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363 (or 1360 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 388401687 is about 19707.9092498418. The cubic root of 388401687 is about 729.6149135539.

The spelling of 388401687 in words is "three hundred eighty-eight million, four hundred one thousand, six hundred eighty-seven".