155388646 has 16 divisors (see below), whose sum is σ = 266962176. Its totient is φ = 66449736.

The previous prime is 155388643. The next prime is 155388661. The reversal of 155388646 is 646883551.

It is a junction number, because it is equal to n+sod(n) for n = 155388596 and 155388605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155388643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5346 + ... + 18421.

It is an arithmetic number, because the mean of its divisors is an integer number (16685136).

Almost surely, 2^155388646 is an apocalyptic number.

155388646 is a deficient number, since it is larger than the sum of its proper divisors (111573530).

155388646 is a wasteful number, since it uses less digits than its factorization.

155388646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24243.

The product of its digits is 691200, while the sum is 46.

The square root of 155388646 is about 12465.4982251012. The cubic root of 155388646 is about 537.6171250797.

The spelling of 155388646 in words is "one hundred fifty-five million, three hundred eighty-eight thousand, six hundred forty-six".