155388442 has 24 divisors (see below), whose sum is σ = 262463796. Its totient is φ = 68904000.

The previous prime is 155388433. The next prime is 155388463. The reversal of 155388442 is 244883551.

It can be written as a sum of positive squares in 2 ways, for example, as 154778481 + 609961 = 12441^2 + 781^2 .

It is a junction number, because it is equal to n+sod(n) for n = 155388395 and 155388404.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2092 + ... + 17752.

Almost surely, 2^155388442 is an apocalyptic number.

155388442 is a deficient number, since it is larger than the sum of its proper divisors (107075354).

155388442 is a wasteful number, since it uses less digits than its factorization.

155388442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15726 (or 15715 counting only the distinct ones).

The product of its digits is 153600, while the sum is 40.

The square root of 155388442 is about 12465.4900425134. The cubic root of 155388442 is about 537.6168898117.

The spelling of 155388442 in words is "one hundred fifty-five million, three hundred eighty-eight thousand, four hundred forty-two".