155503890 has 48 divisors (see below), whose sum is σ = 405758808. Its totient is φ = 41319168.

The previous prime is 155503861. The next prime is 155503891. The reversal of 155503890 is 98305551.

It is a happy number.

155503890 is a `hidden beast` number, since 15 + 550 + 3 + 8 + 90 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 154927809 + 576081 = 12447^2 + 759^2 .

It is not an unprimeable number, because it can be changed into a prime (155503891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23422 + ... + 29318.

Almost surely, 2^155503890 is an apocalyptic number.

155503890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155503890 is an abundant number, since it is smaller than the sum of its proper divisors (250254918).

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

155503890 is a wasteful number, since it uses less digits than its factorization.

155503890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6203 (or 6200 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 155503890 is about 12470.1198871543. The cubic root of 155503890 is about 537.7500001621.

The spelling of 155503890 in words is "one hundred fifty-five million, five hundred three thousand, eight hundred ninety".