7388949681 has 15 divisors (see below), whose sum is σ = 11038969513. Its totient is φ = 4925450700.

The previous prime is 7388949637. The next prime is 7388949707. The reversal of 7388949681 is 1869498837.

The square root of 7388949681 is 85959.

It is a perfect power (a square), and thus also a powerful number.

7388949681 is a `hidden beast` number, since 7 + 388 + 94 + 96 + 81 = 666.

It is not a de Polignac number, because 7388949681 - 2³¹ = 5241466033 is a prime.

It is a super-2 number, since 2×7388949681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7388949611) 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 14 ways as a sum of consecutive naturals, for example, 768856 + ... + 778406.

Almost surely, 2^7388949681 is an apocalyptic number.

7388949681 is the 85959-th square number.

7388949681 is the 42980-th centered octagonal number.

It is an amenable number.

7388949681 is a deficient number, since it is larger than the sum of its proper divisors (3650019832).

7388949681 is an frugal number, since it uses more digits than its factorization.

7388949681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19114 (or 9554 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 63.

The cubic root of 7388949681 is about 1947.7246905225.

The spelling of 7388949681 in words is "seven billion, three hundred eighty-eight million, nine hundred forty-nine thousand, six hundred eighty-one".