155415890 has 32 divisors (see below), whose sum is σ = 320284800. Its totient is φ = 53190144.

The previous prime is 155415859. The next prime is 155415913. The reversal of 155415890 is 98514551.

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 15 ways as a sum of consecutive naturals, for example, 45461 + ... + 48759.

It is an arithmetic number, because the mean of its divisors is an integer number (10008900).

Almost surely, 2^155415890 is an apocalyptic number.

155415890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155415890 is an abundant number, since it is smaller than the sum of its proper divisors (164868910).

155415890 is a wasteful number, since it uses less digits than its factorization.

155415890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3986.

The product of its (nonzero) digits is 36000, while the sum is 38.

The square root of 155415890 is about 12466.5909534243. The cubic root of 155415890 is about 537.6485430445.

The spelling of 155415890 in words is "one hundred fifty-five million, four hundred fifteen thousand, eight hundred ninety".