2649919 has 4 divisors (see below), whose sum is σ = 2660040. Its totient is φ = 2639800.

The previous prime is 2649893. The next prime is 2649923. The reversal of 2649919 is 9199462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9199462 = 2 ⋅4599731.

It is a cyclic number.

It is not a de Polignac number, because 2649919 - 2⁵ = 2649887 is a prime.

It is a super-2 number, since 2×2649919² = 14044141413122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2649929) 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, 4657 + ... + 5194.

It is an arithmetic number, because the mean of its divisors is an integer number (665010).

2^2649919 is an apocalyptic number.

2649919 is a deficient number, since it is larger than the sum of its proper divisors (10121).

2649919 is an equidigital number, since it uses as much as digits as its factorization.

2649919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10120.

The product of its digits is 34992, while the sum is 40.

The square root of 2649919 is about 1627.8571804676. The cubic root of 2649919 is about 138.3813404126.

It can be divided in two parts, 264 and 9919, that multiplied together give a triangular number (2618616 = T₂₂₈₈).

The spelling of 2649919 in words is "two million, six hundred forty-nine thousand, nine hundred nineteen".