1553994 has 48 divisors (see below), whose sum is σ = 3767400. Its totient is φ = 459648.

The previous prime is 1553983. The next prime is 1554019. The reversal of 1553994 is 4993551.

It can be written as a sum of positive squares in 4 ways, for example, as 1404225 + 149769 = 1185^2 + 387^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6672 + ... + 6900.

2^1553994 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1553994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1883700).

1553994 is an abundant number, since it is smaller than the sum of its proper divisors (2213406).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1553994 is a wasteful number, since it uses less digits than its factorization.

1553994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279 (or 276 counting only the distinct ones).

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

The square root of 1553994 is about 1246.5929568227. The cubic root of 1553994 is about 115.8287703578.

It can be divided in two parts, 155399 and 4, that added together give a triangular number (155403 = T₅₅₇).

The spelling of 1553994 in words is "one million, five hundred fifty-three thousand, nine hundred ninety-four".