155278542 has 16 divisors (see below), whose sum is σ = 310706640. Its totient is φ = 51734592.

The previous prime is 155278537. The next prime is 155278549. The reversal of 155278542 is 245872551.

It is a super-2 number, since 2×155278542² = 48222851211291528, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 155278542.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155278549) 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 7 ways as a sum of consecutive naturals, for example, 10884 + ... + 20712.

It is an arithmetic number, because the mean of its divisors is an integer number (19419165).

Almost surely, 2^155278542 is an apocalyptic number.

155278542 is an abundant number, since it is smaller than the sum of its proper divisors (155428098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155278542 is a wasteful number, since it uses less digits than its factorization.

155278542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12467.

The product of its digits is 112000, while the sum is 39.

The square root of 155278542 is about 12461.0810927463. The cubic root of 155278542 is about 537.4901149796.

The spelling of 155278542 in words is "one hundred fifty-five million, two hundred seventy-eight thousand, five hundred forty-two".