155485890 has 48 divisors (see below), whose sum is σ = 462017088. Its totient is φ = 35539488.

The previous prime is 155485879. The next prime is 155485901. The reversal of 155485890 is 98584551.

It is a happy number.

155485890 is a `hidden beast` number, since 1 + 554 + 8 + 5 + 8 + 90 = 666.

It is an interprime number because it is at equal distance from previous prime (155485879) and next prime (155485901).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 122772 + ... + 124031.

It is an arithmetic number, because the mean of its divisors is an integer number (9625356).

Almost surely, 2^155485890 is an apocalyptic number.

155485890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155485890 is an abundant number, since it is smaller than the sum of its proper divisors (306531198).

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

155485890 is a wasteful number, since it uses less digits than its factorization.

155485890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246823 (or 246820 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 45.

The square root of 155485890 is about 12469.3981410492. The cubic root of 155485890 is about 537.7292506844.

The spelling of 155485890 in words is "one hundred fifty-five million, four hundred eighty-five thousand, eight hundred ninety".