1649473389 has 40 divisors (see below), whose sum is σ = 2557068800. Its totient is φ = 1058508000.

The previous prime is 1649473387. The next prime is 1649473393. The reversal of 1649473389 is 9833749461.

It is a happy number.

1649473389 is a `hidden beast` number, since 1 + 6 + 494 + 73 + 3 + 89 = 666.

It is not a de Polignac number, because 1649473389 - 2¹ = 1649473387 is a prime.

It is a super-2 number, since 2×1649473389² = 5441524922038290642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649473381) 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 39 ways as a sum of consecutive naturals, for example, 498039 + ... + 501339.

It is an arithmetic number, because the mean of its divisors is an integer number (63926720).

Almost surely, 2^1649473389 is an apocalyptic number.

It is an amenable number.

1649473389 is a deficient number, since it is larger than the sum of its proper divisors (907595411).

1649473389 is a wasteful number, since it uses less digits than its factorization.

1649473389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3543 (or 3534 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 1649473389 is about 40613.7093725752. The cubic root of 1649473389 is about 1181.5400243269.

The spelling of 1649473389 in words is "one billion, six hundred forty-nine million, four hundred seventy-three thousand, three hundred eighty-nine".