1395621216 has 72 divisors (see below), whose sum is σ = 4329607464. Its totient is φ = 422914560.

The previous prime is 1395621211. The next prime is 1395621233. The reversal of 1395621216 is 6121265931.

1395621216 is a `hidden beast` number, since 1 + 3 + 9 + 5 + 621 + 21 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1395621211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 217101 + ... + 223436.

It is an arithmetic number, because the mean of its divisors is an integer number (60133437).

Almost surely, 2^1395621216 is an apocalyptic number.

1395621216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1395621216 is an abundant number, since it is smaller than the sum of its proper divisors (2933986248).

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

1395621216 is a wasteful number, since it uses less digits than its factorization.

1395621216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440564 (or 440553 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 1395621216 is about 37358.0140799802. The cubic root of 1395621216 is about 1117.5214151415.

The spelling of 1395621216 in words is "one billion, three hundred ninety-five million, six hundred twenty-one thousand, two hundred sixteen".