1387320481 has 8 divisors (see below), whose sum is σ = 1434222944. Its totient is φ = 1341083520.

The previous prime is 1387320433. The next prime is 1387320491. The reversal of 1387320481 is 1840237831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1387320481 - 2⁷ = 1387320353 is a prime.

It is a super-2 number, since 2×1387320481² = 3849316234004142722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1387320481.

It is not an unprimeable number, because it can be changed into a prime (1387320491) 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 in 7 ways as a sum of consecutive naturals, for example, 162135 + ... + 170476.

It is an arithmetic number, because the mean of its divisors is an integer number (179277868).

Almost surely, 2^1387320481 is an apocalyptic number.

It is an amenable number.

1387320481 is a deficient number, since it is larger than the sum of its proper divisors (46902463).

1387320481 is an equidigital number, since it uses as much as digits as its factorization.

1387320481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332751.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 1387320481 is about 37246.7512811520. The cubic root of 1387320481 is about 1115.3014477160.

The spelling of 1387320481 in words is "one billion, three hundred eighty-seven million, three hundred twenty thousand, four hundred eighty-one".