155378 has 4 divisors (see below), whose sum is σ = 233070. Its totient is φ = 77688.

The previous prime is 155377. The next prime is 155381. The reversal of 155378 is 873551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 873551 = 7 ⋅124793.

It can be written as a sum of positive squares in only one way, i.e., 120409 + 34969 = 347^2 + 187^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 155378.

It is not an unprimeable number, because it can be changed into a prime (155371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38843 + ... + 38846.

2¹⁵⁵³⁷⁸ is an apocalyptic number.

155378 is a deficient number, since it is larger than the sum of its proper divisors (77692).

155378 is an equidigital number, since it uses as much as digits as its factorization.

155378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77691.

The product of its digits is 4200, while the sum is 29.

The square root of 155378 is about 394.1801618550. The cubic root of 155378 is about 53.7604847043.

The spelling of 155378 in words is "one hundred fifty-five thousand, three hundred seventy-eight".