1387632646 has 4 divisors (see below), whose sum is σ = 2081448972. Its totient is φ = 693816322.

The previous prime is 1387632611. The next prime is 1387632647. The reversal of 1387632646 is 6462367831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6462367831 = 49391 ⋅130841.

It is a super-2 number, since 2×1387632646² = 3851048720489922632, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1387632596 and 1387632605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387632647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 346908160 + ... + 346908163.

It is an arithmetic number, because the mean of its divisors is an integer number (520362243).

Almost surely, 2^1387632646 is an apocalyptic number.

1387632646 is a deficient number, since it is larger than the sum of its proper divisors (693816326).

1387632646 is an equidigital number, since it uses as much as digits as its factorization.

1387632646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693816325.

The product of its digits is 870912, while the sum is 46.

The square root of 1387632646 is about 37250.9415451476. The cubic root of 1387632646 is about 1115.3850938456.

The spelling of 1387632646 in words is "one billion, three hundred eighty-seven million, six hundred thirty-two thousand, six hundred forty-six".