1553949 has 12 divisors (see below), whose sum is σ = 2342496. Its totient is φ = 990792.

The previous prime is 1553947. The next prime is 1553971. The reversal of 1553949 is 9493551.

It is not a de Polignac number, because 1553949 - 2¹ = 1553947 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1553947) 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 11 ways as a sum of consecutive naturals, for example, 3547 + ... + 3960.

It is an arithmetic number, because the mean of its divisors is an integer number (195208).

2^1553949 is an apocalyptic number.

It is an amenable number.

1553949 is a deficient number, since it is larger than the sum of its proper divisors (788547).

1553949 is a wasteful number, since it uses less digits than its factorization.

1553949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7536 (or 7533 counting only the distinct ones).

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

The square root of 1553949 is about 1246.5749074965. The cubic root of 1553949 is about 115.8276523043.

It can be divided in two parts, 155394 and 9, that added together give a triangular number (155403 = T₅₅₇).

The spelling of 1553949 in words is "one million, five hundred fifty-three thousand, nine hundred forty-nine".