1858213449 has 9 divisors (see below), whose sum is σ = 2684272903. Its totient is φ = 1238722752.

The previous prime is 1858213429. The next prime is 1858213451. The reversal of 1858213449 is 9443128581.

The square root of 1858213449 is 43107.

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

1858213449 is a `hidden beast` number, since 18 + 582 + 13 + 4 + 49 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1122719049 + 735494400 = 33507^2 + 27120^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1858213449 - 2¹⁷ = 1858082377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1858213429) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 122137 + ... + 136505.

Almost surely, 2^1858213449 is an apocalyptic number.

1858213449 is the 43107-th square number.

1858213449 is the 21554-th centered octagonal number.

It is an amenable number.

1858213449 is a deficient number, since it is larger than the sum of its proper divisors (826059454).

1858213449 is an frugal number, since it uses more digits than its factorization.

1858213449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28744 (or 14372 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The cubic root of 1858213449 is about 1229.4150718708.

The spelling of 1858213449 in words is "one billion, eight hundred fifty-eight million, two hundred thirteen thousand, four hundred forty-nine".