1553899 has 4 divisors (see below), whose sum is σ = 1562760. Its totient is φ = 1545040.

The previous prime is 1553897. The next prime is 1553927. The reversal of 1553899 is 9983551.

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

It is a cyclic number.

It is not a de Polignac number, because 1553899 - 2¹ = 1553897 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

1553899 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1553897) 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, 4162 + ... + 4519.

It is an arithmetic number, because the mean of its divisors is an integer number (390690).

2^1553899 is an apocalyptic number.

1553899 is a deficient number, since it is larger than the sum of its proper divisors (8861).

1553899 is an equidigital number, since it uses as much as digits as its factorization.

1553899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8860.

The product of its digits is 48600, while the sum is 40.

The square root of 1553899 is about 1246.5548523832. The cubic root of 1553899 is about 115.8264099974.

The spelling of 1553899 in words is "one million, five hundred fifty-three thousand, eight hundred ninety-nine".