1380634656 has 48 divisors (see below), whose sum is σ = 3712570848. Its totient is φ = 448985600.

The previous prime is 1380634649. The next prime is 1380634663. The reversal of 1380634656 is 6564360831.

It is an interprime number because it is at equal distance from previous prime (1380634649) and next prime (1380634663).

It is a tau number, because it is divible by the number of its divisors (48).

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, 171450 + ... + 179321.

It is an arithmetic number, because the mean of its divisors is an integer number (77345226).

Almost surely, 2^1380634656 is an apocalyptic number.

1380634656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1380634656 is an abundant number, since it is smaller than the sum of its proper divisors (2331936192).

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

1380634656 is a wasteful number, since it uses less digits than its factorization.

1380634656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350825 (or 350817 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 1380634656 is about 37156.8924427218. The cubic root of 1380634656 is about 1113.5069282022.

The spelling of 1380634656 in words is "one billion, three hundred eighty million, six hundred thirty-four thousand, six hundred fifty-six".