1553963 has 4 divisors (see below), whose sum is σ = 1596000. Its totient is φ = 1511928.

The previous prime is 1553947. The next prime is 1553971. The reversal of 1553963 is 3693551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3693551 = 1291 ⋅2861.

It is a cyclic number.

It is not a de Polignac number, because 1553963 - 2⁴ = 1553947 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1553983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20963 + ... + 21036.

It is an arithmetic number, because the mean of its divisors is an integer number (399000).

2^1553963 is an apocalyptic number.

1553963 is a deficient number, since it is larger than the sum of its proper divisors (42037).

1553963 is an equidigital number, since it uses as much as digits as its factorization.

1553963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42036.

The product of its digits is 12150, while the sum is 32.

The square root of 1553963 is about 1246.5805228705. The cubic root of 1553963 is about 115.8280001455.

The spelling of 1553963 in words is "one million, five hundred fifty-three thousand, nine hundred sixty-three".