155706985 has 16 divisors (see below), whose sum is σ = 214131456. Its totient is φ = 106475328.

The previous prime is 155706983. The next prime is 155706997. The reversal of 155706985 is 589607551.

It is a cyclic number.

It is not a de Polignac number, because 155706985 - 2¹ = 155706983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155706983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7092 + ... + 19018.

It is an arithmetic number, because the mean of its divisors is an integer number (13383216).

Almost surely, 2^155706985 is an apocalyptic number.

It is an amenable number.

155706985 is a deficient number, since it is larger than the sum of its proper divisors (58424471).

155706985 is a wasteful number, since it uses less digits than its factorization.

155706985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12312.

The product of its (nonzero) digits is 378000, while the sum is 46.

The square root of 155706985 is about 12478.2604957582. The cubic root of 155706985 is about 537.9840067937.

The spelling of 155706985 in words is "one hundred fifty-five million, seven hundred six thousand, nine hundred eighty-five".