386486640 has 240 divisors, whose sum is σ = 1376950560. Its totient is φ = 100870272.

The previous prime is 386486629. The next prime is 386486651. The reversal of 386486640 is 46684683.

It is an interprime number because it is at equal distance from previous prime (386486629) and next prime (386486651).

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8223097 + ... + 8223143.

It is an arithmetic number, because the mean of its divisors is an integer number (5737294).

Almost surely, 2^386486640 is an apocalyptic number.

386486640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 386486640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (688475280).

386486640 is an abundant number, since it is smaller than the sum of its proper divisors (990463920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

386486640 is an frugal number, since it uses more digits than its factorization.

386486640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 45.

The square root of 386486640 is about 19659.2634653488. The cubic root of 386486640 is about 728.4137948637.

The spelling of 386486640 in words is "three hundred eighty-six million, four hundred eighty-six thousand, six hundred forty".