1395287838 has 144 divisors (see below), whose sum is σ = 3734640000. Its totient is φ = 374328864.

The previous prime is 1395287833. The next prime is 1395287917. The reversal of 1395287838 is 8387825931.

1395287838 is a `hidden beast` number, since 1 + 39 + 528 + 7 + 83 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1395287833) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2329063 + ... + 2329661.

It is an arithmetic number, because the mean of its divisors is an integer number (25935000).

Almost surely, 2^1395287838 is an apocalyptic number.

1395287838 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1395287838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1867320000).

1395287838 is an abundant number, since it is smaller than the sum of its proper divisors (2339352162).

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

1395287838 is a wasteful number, since it uses less digits than its factorization.

1395287838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779 (or 769 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 1395287838 is about 37353.5518793059. The cubic root of 1395287838 is about 1117.4324256843.

The spelling of 1395287838 in words is "one billion, three hundred ninety-five million, two hundred eighty-seven thousand, eight hundred thirty-eight".