1555280 has 20 divisors (see below), whose sum is σ = 3616212. Its totient is φ = 622080.

The previous prime is 1555261. The next prime is 1555289. The reversal of 1555280 is 825551.

It can be written as a sum of positive squares in 2 ways, for example, as 456976 + 1098304 = 676^2 + 1048^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9641 + ... + 9800.

2^1555280 is an apocalyptic number.

1555280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1555280 is an abundant number, since it is smaller than the sum of its proper divisors (2060932).

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

1555280 is a wasteful number, since it uses less digits than its factorization.

1555280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19454 (or 19448 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 1555280 is about 1247.1086560521. The cubic root of 1555280 is about 115.8607127223.

The spelling of 1555280 in words is "one million, five hundred fifty-five thousand, two hundred eighty".