15481890 has 24 divisors (see below), whose sum is σ = 40253148. Its totient is φ = 4128480.

The previous prime is 15481871. The next prime is 15481897. The reversal of 15481890 is 9818451.

It can be written as a sum of positive squares in 2 ways, for example, as 14447601 + 1034289 = 3801^2 + 1017^2 .

It is not an unprimeable number, because it can be changed into a prime (15481897) 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 11 ways as a sum of consecutive naturals, for example, 85921 + ... + 86100.

Almost surely, 2^15481890 is an apocalyptic number.

15481890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15481890 is an abundant number, since it is smaller than the sum of its proper divisors (24771258).

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

15481890 is a wasteful number, since it uses less digits than its factorization.

15481890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172034 (or 172031 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 15481890 is about 3934.7032924987. The cubic root of 15481890 is about 249.2344045142.

The spelling of 15481890 in words is "fifteen million, four hundred eighty-one thousand, eight hundred ninety".