7838136621 has 24 divisors (see below), whose sum is σ = 13240061120. Its totient is φ = 4374772416.

The previous prime is 7838136619. The next prime is 7838136641. The reversal of 7838136621 is 1266318387.

7838136621 is a `hidden beast` number, since 7 + 8 + 3 + 8 + 13 + 6 + 621 = 666.

It is not a de Polignac number, because 7838136621 - 2¹ = 7838136619 is a prime.

It is a super-2 number, since 2×7838136621² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7838136641) 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 23 ways as a sum of consecutive naturals, for example, 1443976 + ... + 1449393.

Almost surely, 2^7838136621 is an apocalyptic number.

It is an amenable number.

7838136621 is a deficient number, since it is larger than the sum of its proper divisors (5401924499).

7838136621 is a wasteful number, since it uses less digits than its factorization.

7838136621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2893425 (or 2893422 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 7838136621 is about 88533.2514990837. The cubic root of 7838136621 is about 1986.4193771515.

The spelling of 7838136621 in words is "seven billion, eight hundred thirty-eight million, one hundred thirty-six thousand, six hundred twenty-one".