2649389421 has 16 divisors (see below), whose sum is σ = 4078788224. Its totient is φ = 1498328064.

The previous prime is 2649389419. The next prime is 2649389423. The reversal of 2649389421 is 1249839462.

It is an interprime number because it is at equal distance from previous prime (2649389419) and next prime (2649389423).

It is not a de Polignac number, because 2649389421 - 2¹ = 2649389419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2649389423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 648280 + ... + 652353.

It is an arithmetic number, because the mean of its divisors is an integer number (254924264).

Almost surely, 2^2649389421 is an apocalyptic number.

2649389421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2649389421 is a deficient number, since it is larger than the sum of its proper divisors (1429398803).

2649389421 is a wasteful number, since it uses less digits than its factorization.

2649389421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300740.

The product of its digits is 746496, while the sum is 48.

The square root of 2649389421 is about 51472.2198957846. The cubic root of 2649389421 is about 1383.7212142212.

The spelling of 2649389421 in words is "two billion, six hundred forty-nine million, three hundred eighty-nine thousand, four hundred twenty-one".