155409987 has 8 divisors (see below), whose sum is σ = 218119360. Its totient is φ = 98153640.

The previous prime is 155409977. The next prime is 155409997. The reversal of 155409987 is 789904551.

It is an interprime number because it is at equal distance from previous prime (155409977) and next prime (155409997).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 155409987 - 2¹⁰ = 155408963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155409907) 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 7 ways as a sum of consecutive naturals, for example, 1363189 + ... + 1363302.

It is an arithmetic number, because the mean of its divisors is an integer number (27264920).

Almost surely, 2^155409987 is an apocalyptic number.

155409987 is a deficient number, since it is larger than the sum of its proper divisors (62709373).

155409987 is a wasteful number, since it uses less digits than its factorization.

155409987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2726513.

The product of its (nonzero) digits is 453600, while the sum is 48.

The square root of 155409987 is about 12466.3541984014. The cubic root of 155409987 is about 537.6417359766.

The spelling of 155409987 in words is "one hundred fifty-five million, four hundred nine thousand, nine hundred eighty-seven".