390986687 has 16 divisors (see below), whose sum is σ = 489377280. Its totient is φ = 304104672.

The previous prime is 390986669. The next prime is 390986711. The reversal of 390986687 is 786689093.

It is a cyclic number.

It is not a de Polignac number, because 390986687 - 2¹² = 390982591 is a prime.

It is a super-2 number, since 2×390986687² = 305741178822471938, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390986627) 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, 31043 + ... + 41780.

It is an arithmetic number, because the mean of its divisors is an integer number (30586080).

Almost surely, 2^390986687 is an apocalyptic number.

390986687 is a deficient number, since it is larger than the sum of its proper divisors (98390593).

390986687 is a wasteful number, since it uses less digits than its factorization.

390986687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72902.

The product of its (nonzero) digits is 3919104, while the sum is 56.

The square root of 390986687 is about 19773.3832967451. The cubic root of 390986687 is about 731.2299818515.

The spelling of 390986687 in words is "three hundred ninety million, nine hundred eighty-six thousand, six hundred eighty-seven".