155140393 has 4 divisors (see below), whose sum is σ = 155378628. Its totient is φ = 154902160.

The previous prime is 155140379. The next prime is 155140409. The reversal of 155140393 is 393041551.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12027024 + 143113369 = 3468^2 + 11963^2 .

It is a cyclic number.

It is not a de Polignac number, because 155140393 - 2⁵ = 155140361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155140333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118138 + ... + 119443.

It is an arithmetic number, because the mean of its divisors is an integer number (38844657).

Almost surely, 2^155140393 is an apocalyptic number.

It is an amenable number.

155140393 is a deficient number, since it is larger than the sum of its proper divisors (238235).

155140393 is an equidigital number, since it uses as much as digits as its factorization.

155140393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238234.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 155140393 is about 12455.5366403861. The cubic root of 155140393 is about 537.3306687083.

The spelling of 155140393 in words is "one hundred fifty-five million, one hundred forty thousand, three hundred ninety-three".