1258479921 has 4 divisors (see below), whose sum is σ = 1677973232. Its totient is φ = 838986612.

The previous prime is 1258479919. The next prime is 1258479967. The reversal of 1258479921 is 1299748521.

It is a happy number.

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 1258479921 - 2¹ = 1258479919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1258479721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209746651 + ... + 209746656.

It is an arithmetic number, because the mean of its divisors is an integer number (419493308).

Almost surely, 2^1258479921 is an apocalyptic number.

It is an amenable number.

1258479921 is a deficient number, since it is larger than the sum of its proper divisors (419493311).

1258479921 is an equidigital number, since it uses as much as digits as its factorization.

1258479921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419493310.

The product of its digits is 362880, while the sum is 48.

The square root of 1258479921 is about 35475.0605496312. The cubic root of 1258479921 is about 1079.6477820923.

The spelling of 1258479921 in words is "one billion, two hundred fifty-eight million, four hundred seventy-nine thousand, nine hundred twenty-one".