253987 has 2 divisors, whose sum is σ = 253988. Its totient is φ = 253986.

The previous prime is 253969. The next prime is 253993. The reversal of 253987 is 789352.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 253987 - 2¹¹ = 251939 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (253907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126993 + 126994.

It is an arithmetic number, because the mean of its divisors is an integer number (126994).

2²⁵³⁹⁸⁷ is an apocalyptic number.

253987 is a deficient number, since it is larger than the sum of its proper divisors (1).

253987 is an equidigital number, since it uses as much as digits as its factorization.

253987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 34.

The square root of 253987 is about 503.9712293375. The cubic root of 253987 is about 63.3291748578.

The spelling of 253987 in words is "two hundred fifty-three thousand, nine hundred eighty-seven".