1553855 has 4 divisors (see below), whose sum is σ = 1864632. Its totient is φ = 1243080.

The previous prime is 1553837. The next prime is 1553869. The reversal of 1553855 is 5583551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5583551 = 73 ⋅76487.

It is not a de Polignac number, because 1553855 - 2²⁰ = 505279 is a prime.

It is a super-2 number, since 2×1553855² = 4828930722050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155381 + ... + 155390.

It is an arithmetic number, because the mean of its divisors is an integer number (466158).

2^1553855 is an apocalyptic number.

1553855 is a deficient number, since it is larger than the sum of its proper divisors (310777).

1553855 is an equidigital number, since it uses as much as digits as its factorization.

1553855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310776.

The product of its digits is 15000, while the sum is 32.

The square root of 1553855 is about 1246.5372036165. The cubic root of 1553855 is about 115.8253167453.

The spelling of 1553855 in words is "one million, five hundred fifty-three thousand, eight hundred fifty-five".