253999 has 2 divisors, whose sum is σ = 254000. Its totient is φ = 253998.

The previous prime is 253993. The next prime is 254003. The reversal of 253999 is 999352.

253999 = T₄₁₀ + T₄₁₁ + T₄₁₂.

253999 is nontrivially palindromic in base 4.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 253999 - 2⁷ = 253871 is a prime.

253999 is a modest number, since divided by 999 gives 253 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126999 + 127000.

It is an arithmetic number, because the mean of its divisors is an integer number (127000).

2²⁵³⁹⁹⁹ is an apocalyptic number.

253999 is the 412-nd centered triangular number.

253999 is a deficient number, since it is larger than the sum of its proper divisors (1).

253999 is an equidigital number, since it uses as much as digits as its factorization.

253999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21870, while the sum is 37.

The square root of 253999 is about 503.9831346385. The cubic root of 253999 is about 63.3301722029.

The spelling of 253999 in words is "two hundred fifty-three thousand, nine hundred ninety-nine".