1857006649 has 3 divisors (see below), whose sum is σ = 1857049743. Its totient is φ = 1856963556.

The previous prime is 1857006601. The next prime is 1857006661. The reversal of 1857006649 is 9466007581.

The square root of 1857006649 is 43093.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 570493225 + 1286513424 = 23885^2 + 35868^2 .

It is not a de Polignac number, because 1857006649 - 2¹¹ = 1857004601 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1857006599 and 1857006608.

It is not an unprimeable number, because it can be changed into a prime (1857006149) by changing a digit.

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 2 ways as a sum of consecutive naturals, for example, 21547 + ... + 64639.

It is an arithmetic number, because the mean of its divisors is an integer number (619016581).

Almost surely, 2^1857006649 is an apocalyptic number.

1857006649 is the 43093-rd square number.

1857006649 is the 21547-th centered octagonal number.

It is an amenable number.

1857006649 is a deficient number, since it is larger than the sum of its proper divisors (43094).

1857006649 is an frugal number, since it uses more digits than its factorization.

1857006649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86186 (or 43093 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 46.

The cubic root of 1857006649 is about 1229.1488700506.

The spelling of 1857006649 in words is "one billion, eight hundred fifty-seven million, six thousand, six hundred forty-nine".