1555838 has 4 divisors (see below), whose sum is σ = 2333760. Its totient is φ = 777918.

The previous prime is 1555837. The next prime is 1555847. The reversal of 1555838 is 8385551.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×1555838³ = 11298333199220221416, which contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1555798 and 1555807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 388958 + ... + 388961.

It is an arithmetic number, because the mean of its divisors is an integer number (583440).

2^1555838 is an apocalyptic number.

1555838 is a deficient number, since it is larger than the sum of its proper divisors (777922).

1555838 is an equidigital number, since it uses as much as digits as its factorization.

1555838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777921.

The product of its digits is 24000, while the sum is 35.

The square root of 1555838 is about 1247.3323534648. The cubic root of 1555838 is about 115.8745671510.

The spelling of 1555838 in words is "one million, five hundred fifty-five thousand, eight hundred thirty-eight".