1386663390 has 96 divisors (see below), whose sum is σ = 4137921216. Its totient is φ = 315601920.

The previous prime is 1386663389. The next prime is 1386663401. The reversal of 1386663390 is 933666831.

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, 147264 + ... + 156396.

It is an arithmetic number, because the mean of its divisors is an integer number (43103346).

Almost surely, 2^1386663390 is an apocalyptic number.

1386663390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1386663390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2068960608).

1386663390 is an abundant number, since it is smaller than the sum of its proper divisors (2751257826).

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

1386663390 is a wasteful number, since it uses less digits than its factorization.

1386663390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9394 (or 9391 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 45.

The square root of 1386663390 is about 37237.9294537169. The cubic root of 1386663390 is about 1115.1253359746.

The spelling of 1386663390 in words is "one billion, three hundred eighty-six million, six hundred sixty-three thousand, three hundred ninety".