155286987 has 16 divisors (see below), whose sum is σ = 210559008. Its totient is φ = 101779200.

The previous prime is 155286949. The next prime is 155287021. The reversal of 155286987 is 789682551.

It is not a de Polignac number, because 155286987 - 2¹⁵ = 155254219 is a prime.

It is a super-2 number, since 2×155286987² = 48228096663076338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155286917) 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, 80737 + ... + 82637.

It is an arithmetic number, because the mean of its divisors is an integer number (13159938).

Almost surely, 2^155286987 is an apocalyptic number.

155286987 is a deficient number, since it is larger than the sum of its proper divisors (55272021).

155286987 is a wasteful number, since it uses less digits than its factorization.

155286987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2350.

The product of its digits is 1209600, while the sum is 51.

The square root of 155286987 is about 12461.4199431686. The cubic root of 155286987 is about 537.4998588065.

The spelling of 155286987 in words is "one hundred fifty-five million, two hundred eighty-six thousand, nine hundred eighty-seven".