2154726789 has 4 divisors (see below), whose sum is σ = 2872969056. Its totient is φ = 1436484524.

The previous prime is 2154726737. The next prime is 2154726793. The reversal of 2154726789 is 9876274512.

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 a cyclic number.

It is not a de Polignac number, because 2154726789 - 2⁷ = 2154726661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154727789) 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, 359121129 + ... + 359121134.

It is an arithmetic number, because the mean of its divisors is an integer number (718242264).

Almost surely, 2^2154726789 is an apocalyptic number.

It is an amenable number.

2154726789 is a deficient number, since it is larger than the sum of its proper divisors (718242267).

2154726789 is an equidigital number, since it uses as much as digits as its factorization.

2154726789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718242266.

The product of its digits is 1693440, while the sum is 51.

The square root of 2154726789 is about 46419.0347702319. The cubic root of 2154726789 is about 1291.6080319541.

The spelling of 2154726789 in words is "two billion, one hundred fifty-four million, seven hundred twenty-six thousand, seven hundred eighty-nine".