3649488921 has 27 divisors (see below), whose sum is σ = 5711862429. Its totient is φ = 2244389472.

The previous prime is 3649488881. The next prime is 3649488949. The reversal of 3649488921 is 1298849463.

The square root of 3649488921 is 60411.

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

3649488921 is a `hidden beast` number, since 36 + 49 + 488 + 92 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1014104025 + 2635384896 = 31845^2 + 51336^2 .

It is not a de Polignac number, because 3649488921 - 2¹⁷ = 3649357849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3649488121) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2355255 + ... + 2356803.

Almost surely, 2^3649488921 is an apocalyptic number.

3649488921 is the 60411-st square number.

3649488921 is the 30206-th centered octagonal number.

It is an amenable number.

3649488921 is a deficient number, since it is larger than the sum of its proper divisors (2062373508).

3649488921 is an equidigital number, since it uses as much as digits as its factorization.

3649488921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3130 (or 1565 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 54.

The cubic root of 3649488921 is about 1539.6098580207.

The spelling of 3649488921 in words is "three billion, six hundred forty-nine million, four hundred eighty-eight thousand, nine hundred twenty-one".