7921647405 has 48 divisors (see below), whose sum is σ = 15881523840. Its totient is φ = 3577682304.

The previous prime is 7921647389. The next prime is 7921647427. The reversal of 7921647405 is 5047461297.

It is not a de Polignac number, because 7921647405 - 2⁴ = 7921647389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 125350 + ... + 177639.

It is an arithmetic number, because the mean of its divisors is an integer number (330865080).

Almost surely, 2^7921647405 is an apocalyptic number.

It is an amenable number.

7921647405 is an abundant number, since it is smaller than the sum of its proper divisors (7959876435).

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

7921647405 is a wasteful number, since it uses less digits than its factorization.

7921647405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303090 (or 303087 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The square root of 7921647405 is about 89003.6370324269. The cubic root of 7921647405 is about 1993.4491839140.

It can be divided in two parts, 79216 and 47405, that added together give a palindrome (126621).

The spelling of 7921647405 in words is "seven billion, nine hundred twenty-one million, six hundred forty-seven thousand, four hundred five".