1387285770 has 128 divisors (see below), whose sum is σ = 3716407296. Its totient is φ = 329204736.

The previous prime is 1387285769. The next prime is 1387285787. The reversal of 1387285770 is 775827831.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1832232 + ... + 1832988.

It is an arithmetic number, because the mean of its divisors is an integer number (29034432).

Almost surely, 2^1387285770 is an apocalyptic number.

1387285770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1387285770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1858203648).

1387285770 is an abundant number, since it is smaller than the sum of its proper divisors (2329121526).

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

1387285770 is a wasteful number, since it uses less digits than its factorization.

1387285770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944.

The product of its (nonzero) digits is 658560, while the sum is 48.

The square root of 1387285770 is about 37246.2853181361. The cubic root of 1387285770 is about 1115.2921459596.

The spelling of 1387285770 in words is "one billion, three hundred eighty-seven million, two hundred eighty-five thousand, seven hundred seventy".