1387849788 has 168 divisors, whose sum is σ = 4051479936. Its totient is φ = 412905600.

The previous prime is 1387849783. The next prime is 1387849789. The reversal of 1387849788 is 8879487831.

1387849788 is a `hidden beast` number, since 138 + 7 + 8 + 497 + 8 + 8 = 666.

It is a super-2 number, since 2×1387849788² = 3852254068103289888, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387849783) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1174558 + ... + 1175738.

It is an arithmetic number, because the mean of its divisors is an integer number (24115952).

Almost surely, 2^1387849788 is an apocalyptic number.

1387849788 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1387849788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2025739968).

1387849788 is an abundant number, since it is smaller than the sum of its proper divisors (2663630148).

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

1387849788 is a wasteful number, since it uses less digits than its factorization.

1387849788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247 (or 1230 counting only the distinct ones).

The product of its digits is 21676032, while the sum is 63.

The square root of 1387849788 is about 37253.8560151832. The cubic root of 1387849788 is about 1115.4432707025.

The spelling of 1387849788 in words is "one billion, three hundred eighty-seven million, eight hundred forty-nine thousand, seven hundred eighty-eight".