155240985 has 16 divisors (see below), whose sum is σ = 249762240. Its totient is φ = 82336320.

The previous prime is 155240983. The next prime is 155240993. The reversal of 155240985 is 589042551.

It is not a de Polignac number, because 155240985 - 2¹ = 155240983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155240983) 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, 25875 + ... + 31304.

It is an arithmetic number, because the mean of its divisors is an integer number (15610140).

Almost surely, 2^155240985 is an apocalyptic number.

155240985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155240985 is a deficient number, since it is larger than the sum of its proper divisors (94521255).

155240985 is a wasteful number, since it uses less digits than its factorization.

155240985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57368.

The product of its (nonzero) digits is 72000, while the sum is 39.

The square root of 155240985 is about 12459.5740296368. The cubic root of 155240985 is about 537.4467774956.

The spelling of 155240985 in words is "one hundred fifty-five million, two hundred forty thousand, nine hundred eighty-five".