1380649536 has 140 divisors (see below), whose sum is σ = 4677468928. Its totient is φ = 394460928.

The previous prime is 1380649531. The next prime is 1380649537. The reversal of 1380649536 is 6359460831.

It is a junction number, because it is equal to n+sod(n) for n = 1380649491 and 1380649500.

It is not an unprimeable number, because it can be changed into a prime (1380649531) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17265 + ... + 55311.

Almost surely, 2^1380649536 is an apocalyptic number.

1380649536 is a gapful number since it is divisible by the number (16) 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 1380649536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2338734464).

1380649536 is an abundant number, since it is smaller than the sum of its proper divisors (3296819392).

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

1380649536 is an equidigital number, since it uses as much as digits as its factorization.

1380649536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38078 (or 38059 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The square root of 1380649536 is about 37157.0926742123. The cubic root of 1380649536 is about 1113.5109285179.

The spelling of 1380649536 in words is "one billion, three hundred eighty million, six hundred forty-nine thousand, five hundred thirty-six".