395138660 has 48 divisors (see below), whose sum is σ = 953213184. Its totient is φ = 134779008.

The previous prime is 395138647. The next prime is 395138671. The reversal of 395138660 is 66831593.

It is a super-2 number, since 2×395138660² = 312269121253191200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20417 + ... + 34743.

It is an arithmetic number, because the mean of its divisors is an integer number (19858608).

Almost surely, 2^395138660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 395138660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (476606592).

395138660 is an abundant number, since it is smaller than the sum of its proper divisors (558074524).

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

395138660 is a wasteful number, since it uses less digits than its factorization.

395138660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14540 (or 14538 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 395138660 is about 19878.0949791473. The cubic root of 395138660 is about 733.8092370046.

The spelling of 395138660 in words is "three hundred ninety-five million, one hundred thirty-eight thousand, six hundred sixty".