1386385690 has 16 divisors (see below), whose sum is σ = 2499026760. Its totient is φ = 553769280.

The previous prime is 1386385669. The next prime is 1386385709. The reversal of 1386385690 is 965836831.

It can be written as a sum of positive squares in 4 ways, for example, as 509811241 + 876574449 = 22579^2 + 29607^2 .

It is a super-2 number, since 2×1386385690² = 3844130562873552200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90681 + ... + 104860.

Almost surely, 2^1386385690 is an apocalyptic number.

1386385690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1386385690 is a deficient number, since it is larger than the sum of its proper divisors (1112641070).

1386385690 is a wasteful number, since it uses less digits than its factorization.

1386385690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196257.

The product of its (nonzero) digits is 933120, while the sum is 49.

The square root of 1386385690 is about 37234.2005419748. The cubic root of 1386385690 is about 1115.0508908515.

The spelling of 1386385690 in words is "one billion, three hundred eighty-six million, three hundred eighty-five thousand, six hundred ninety".