2154839 has 2 divisors, whose sum is σ = 2154840. Its totient is φ = 2154838.

The previous prime is 2154829. The next prime is 2154851. The reversal of 2154839 is 9384512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2154839 - 2¹⁶ = 2089303 is a prime.

It is a super-2 number, since 2×2154839² = 9286662231842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2154829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077419 + 1077420.

It is an arithmetic number, because the mean of its divisors is an integer number (1077420).

2^2154839 is an apocalyptic number.

2154839 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154839 is an equidigital number, since it uses as much as digits as its factorization.

2154839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 32.

The square root of 2154839 is about 1467.9369877485. The cubic root of 2154839 is about 129.1630452448.

The spelling of 2154839 in words is "two million, one hundred fifty-four thousand, eight hundred thirty-nine".