1994553 has 12 divisors (see below), whose sum is σ = 3143088. Its totient is φ = 1208760.

The previous prime is 1994543. The next prime is 1994567. The reversal of 1994553 is 3554991.

1994553 is a `hidden beast` number, since 19 + 94 + 553 = 666.

It is not a de Polignac number, because 1994553 - 2⁵ = 1994521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1994543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9975 + ... + 10172.

It is an arithmetic number, because the mean of its divisors is an integer number (261924).

2^1994553 is an apocalyptic number.

It is an amenable number.

1994553 is a deficient number, since it is larger than the sum of its proper divisors (1148535).

1994553 is a wasteful number, since it uses less digits than its factorization.

1994553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20164 (or 20161 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 1994553 is about 1412.2864440332. The cubic root of 1994553 is about 125.8776211616.

The spelling of 1994553 in words is "one million, nine hundred ninety-four thousand, five hundred fifty-three".