155399 has 2 divisors, whose sum is σ = 155400. Its totient is φ = 155398.

The previous prime is 155387. The next prime is 155413. The reversal of 155399 is 993551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155399 - 2⁴ = 155383 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77699 + 77700.

It is an arithmetic number, because the mean of its divisors is an integer number (77700).

2¹⁵⁵³⁹⁹ is an apocalyptic number.

155399 is a deficient number, since it is larger than the sum of its proper divisors (1).

155399 is an equidigital number, since it uses as much as digits as its factorization.

155399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6075, while the sum is 32.

The square root of 155399 is about 394.2067985208. The cubic root of 155399 is about 53.7629065815.

The spelling of 155399 in words is "one hundred fifty-five thousand, three hundred ninety-nine".