155539442 has 4 divisors (see below), whose sum is σ = 233309166. Its totient is φ = 77769720.

The previous prime is 155539411. The next prime is 155539457. The reversal of 155539442 is 244935551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244935551 = 7 ⋅34990793.

It can be written as a sum of positive squares in only one way, i.e., 98823481 + 56715961 = 9941^2 + 7531^2 .

It is a junction number, because it is equal to n+sod(n) for n = 155539396 and 155539405.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38884859 + ... + 38884862.

Almost surely, 2^155539442 is an apocalyptic number.

155539442 is a deficient number, since it is larger than the sum of its proper divisors (77769724).

155539442 is an equidigital number, since it uses as much as digits as its factorization.

155539442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77769723.

The product of its digits is 108000, while the sum is 38.

The square root of 155539442 is about 12471.5452931864. The cubic root of 155539442 is about 537.7909779821.

The spelling of 155539442 in words is "one hundred fifty-five million, five hundred thirty-nine thousand, four hundred forty-two".