1555680 has 96 divisors (see below), whose sum is σ = 5612544. Its totient is φ = 354816.

The previous prime is 1555679. The next prime is 1555691. The reversal of 1555680 is 865551.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3129 + ... + 3591.

It is an arithmetic number, because the mean of its divisors is an integer number (58464).

2^1555680 is an apocalyptic number.

1555680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1555680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2806272).

1555680 is an abundant number, since it is smaller than the sum of its proper divisors (4056864).

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

1555680 is a wasteful number, since it uses less digits than its factorization.

1555680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 30.

The square root of 1555680 is about 1247.2690166921. The cubic root of 1555680 is about 115.8706445486.

Subtracting from 1555680 its product of nonzero digits (6000), we obtain a triangular number (1549680 = T₁₇₆₀).

The spelling of 1555680 in words is "one million, five hundred fifty-five thousand, six hundred eighty".