155785406 has 12 divisors (see below), whose sum is σ = 271829808. Its totient is φ = 66765132.

The previous prime is 155785403. The next prime is 155785451. The reversal of 155785406 is 604587551.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155785403) 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 5 ways as a sum of consecutive naturals, for example, 794726 + ... + 794921.

It is an arithmetic number, because the mean of its divisors is an integer number (22652484).

Almost surely, 2^155785406 is an apocalyptic number.

155785406 is a deficient number, since it is larger than the sum of its proper divisors (116044402).

155785406 is a wasteful number, since it uses less digits than its factorization.

155785406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1589663 (or 1589656 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 41.

The square root of 155785406 is about 12481.4024051787. The cubic root of 155785406 is about 538.0743092358.

The spelling of 155785406 in words is "one hundred fifty-five million, seven hundred eighty-five thousand, four hundred six".