1258238649 has 4 divisors (see below), whose sum is σ = 1677651536. Its totient is φ = 838825764.

The previous prime is 1258238599. The next prime is 1258238651. The reversal of 1258238649 is 9468328521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1258238649 - 2¹² = 1258234553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1258238598 and 1258238607.

It is not an unprimeable number, because it can be changed into a prime (1258238249) 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 3 ways as a sum of consecutive naturals, for example, 209706439 + ... + 209706444.

It is an arithmetic number, because the mean of its divisors is an integer number (419412884).

Almost surely, 2^1258238649 is an apocalyptic number.

It is an amenable number.

1258238649 is a deficient number, since it is larger than the sum of its proper divisors (419412887).

1258238649 is an equidigital number, since it uses as much as digits as its factorization.

1258238649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419412886.

The product of its digits is 829440, while the sum is 48.

The square root of 1258238649 is about 35471.6598004661. The cubic root of 1258238649 is about 1079.5787820700.

The spelling of 1258238649 in words is "one billion, two hundred fifty-eight million, two hundred thirty-eight thousand, six hundred forty-nine".