1387551657 has 8 divisors (see below), whose sum is σ = 1850314176. Its totient is φ = 924911792.

The previous prime is 1387551653. The next prime is 1387551667. The reversal of 1387551657 is 7561557831.

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 1387551657 - 2² = 1387551653 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1387551653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163 + ... + 52679.

It is an arithmetic number, because the mean of its divisors is an integer number (231289272).

Almost surely, 2^1387551657 is an apocalyptic number.

It is an amenable number.

1387551657 is a deficient number, since it is larger than the sum of its proper divisors (462762519).

1387551657 is an equidigital number, since it uses as much as digits as its factorization.

1387551657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61327.

The product of its digits is 882000, while the sum is 48.

The square root of 1387551657 is about 37249.8544560915. The cubic root of 1387551657 is about 1115.3633936545.

The spelling of 1387551657 in words is "one billion, three hundred eighty-seven million, five hundred fifty-one thousand, six hundred fifty-seven".