1395331644 has 72 divisors (see below), whose sum is σ = 4010141520. Its totient is φ = 375212544.

The previous prime is 1395331643. The next prime is 1395331703. The reversal of 1395331644 is 4461335931.

It is a happy number.

It is a super-4 number, since 4×1395331644⁴ (a number of 38 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1395331643) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59799 + ... + 79790.

It is an arithmetic number, because the mean of its divisors is an integer number (55696410).

Almost surely, 2^1395331644 is an apocalyptic number.

1395331644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1395331644 is an abundant number, since it is smaller than the sum of its proper divisors (2614809876).

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

1395331644 is a wasteful number, since it uses less digits than its factorization.

1395331644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139627 (or 139618 counting only the distinct ones).

The product of its digits is 116640, while the sum is 39.

The square root of 1395331644 is about 37354.1382446443. The cubic root of 1395331644 is about 1117.4441197428. Note that the first 3 decimals are identical.

The spelling of 1395331644 in words is "one billion, three hundred ninety-five million, three hundred thirty-one thousand, six hundred forty-four".