1387651487 has 4 divisors (see below), whose sum is σ = 1388036040. Its totient is φ = 1387266936.

The previous prime is 1387651483. The next prime is 1387651493. The reversal of 1387651487 is 7841567831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1387651487 - 2² = 1387651483 is a prime.

It is a super-2 number, since 2×1387651487² = 3851153298746622338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387651483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186812 + ... + 194097.

It is an arithmetic number, because the mean of its divisors is an integer number (347009010).

Almost surely, 2^1387651487 is an apocalyptic number.

1387651487 is a deficient number, since it is larger than the sum of its proper divisors (384553).

1387651487 is an equidigital number, since it uses as much as digits as its factorization.

1387651487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384552.

The product of its digits is 1128960, while the sum is 50.

The square root of 1387651487 is about 37251.1944372258. The cubic root of 1387651487 is about 1115.3901419817.

The spelling of 1387651487 in words is "one billion, three hundred eighty-seven million, six hundred fifty-one thousand, four hundred eighty-seven".