747836921 has 8 divisors (see below), whose sum is σ = 806711304. Its totient is φ = 689155200.

The previous prime is 747836911. The next prime is 747836981. The reversal of 747836921 is 129638747.

It can be written as a sum of positive squares in 4 ways, for example, as 7398400 + 740438521 = 2720^2 + 27211^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 747836921 - 2¹⁴ = 747820537 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (747836911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40046 + ... + 55671.

It is an arithmetic number, because the mean of its divisors is an integer number (100838913).

Almost surely, 2^747836921 is an apocalyptic number.

It is an amenable number.

747836921 is a deficient number, since it is larger than the sum of its proper divisors (58874383).

747836921 is a wasteful number, since it uses less digits than its factorization.

747836921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96331.

The product of its digits is 508032, while the sum is 47.

The square root of 747836921 is about 27346.6071204455. The cubic root of 747836921 is about 907.6859941511.

The spelling of 747836921 in words is "seven hundred forty-seven million, eight hundred thirty-six thousand, nine hundred twenty-one".