9378732621 has 4 divisors (see below), whose sum is σ = 12504976832. Its totient is φ = 6252488412.

The previous prime is 9378732593. The next prime is 9378732637. The reversal of 9378732621 is 1262378739.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1262378739 = 3 ⋅420792913.

It is not a de Polignac number, because 9378732621 - 2²⁶ = 9311623757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9378732421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1563122101 + ... + 1563122106.

It is an arithmetic number, because the mean of its divisors is an integer number (3126244208).

Almost surely, 2^9378732621 is an apocalyptic number.

It is an amenable number.

9378732621 is a deficient number, since it is larger than the sum of its proper divisors (3126244211).

9378732621 is a wasteful number, since it uses less digits than its factorization.

9378732621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3126244210.

The product of its digits is 762048, while the sum is 48.

The square root of 9378732621 is about 96843.8569089439. The cubic root of 9378732621 is about 2108.8614674103.

The spelling of 9378732621 in words is "nine billion, three hundred seventy-eight million, seven hundred thirty-two thousand, six hundred twenty-one".