155990500 has 24 divisors (see below), whose sum is σ = 340684344. Its totient is φ = 62396000.

The previous prime is 155990473. The next prime is 155990533. The reversal of 155990500 is 5099551.

It can be written as a sum of positive squares in 4 ways, for example, as 9144576 + 146845924 = 3024^2 + 12118^2 .

It is an unprimeable number.

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, 155491 + ... + 156490.

It is an arithmetic number, because the mean of its divisors is an integer number (14195181).

Almost surely, 2^155990500 is an apocalyptic number.

155990500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155990500 is an abundant number, since it is smaller than the sum of its proper divisors (184693844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155990500 is a wasteful number, since it uses less digits than its factorization.

155990500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312000 (or 311988 counting only the distinct ones).

The product of its (nonzero) digits is 10125, while the sum is 34.

The square root of 155990500 is about 12489.6156866414. The cubic root of 155990500 is about 538.3103335254.

The spelling of 155990500 in words is "one hundred fifty-five million, nine hundred ninety thousand, five hundred".