2457139809 has 4 divisors (see below), whose sum is σ = 3276186416. Its totient is φ = 1638093204.

The previous prime is 2457139807. The next prime is 2457139823. The reversal of 2457139809 is 9089317542.

2457139809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2457139809 - 2¹ = 2457139807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2457139807) 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, 409523299 + ... + 409523304.

It is an arithmetic number, because the mean of its divisors is an integer number (819046604).

Almost surely, 2^2457139809 is an apocalyptic number.

It is an amenable number.

2457139809 is a deficient number, since it is larger than the sum of its proper divisors (819046607).

2457139809 is an equidigital number, since it uses as much as digits as its factorization.

2457139809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819046606.

The product of its (nonzero) digits is 544320, while the sum is 48.

The square root of 2457139809 is about 49569.5451764488. The cubic root of 2457139809 is about 1349.4080274275.

The spelling of 2457139809 in words is "two billion, four hundred fifty-seven million, one hundred thirty-nine thousand, eight hundred nine".