1387501057 has 4 divisors (see below), whose sum is σ = 1408210096. Its totient is φ = 1366792020.

The previous prime is 1387501039. The next prime is 1387501103. The reversal of 1387501057 is 7501057831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1387501057 - 2¹⁵ = 1387468289 is a prime.

It is a super-2 number, since 2×1387501057² = 3850318366352234498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1387501457) 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 3 ways as a sum of consecutive naturals, for example, 10354419 + ... + 10354552.

It is an arithmetic number, because the mean of its divisors is an integer number (352052524).

Almost surely, 2^1387501057 is an apocalyptic number.

It is an amenable number.

1387501057 is a deficient number, since it is larger than the sum of its proper divisors (20709039).

1387501057 is an equidigital number, since it uses as much as digits as its factorization.

1387501057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20709038.

The product of its (nonzero) digits is 29400, while the sum is 37.

The square root of 1387501057 is about 37249.1752526147. The cubic root of 1387501057 is about 1115.3498354628.

Adding to 1387501057 its reverse (7501057831), we get a palindrome (8888558888).

The spelling of 1387501057 in words is "one billion, three hundred eighty-seven million, five hundred one thousand, fifty-seven".