1561439 has 16 divisors (see below), whose sum is σ = 1858560. Its totient is φ = 1296000.

The previous prime is 1561429. The next prime is 1561453. The reversal of 1561439 is 9341651.

It is a cyclic number.

It is not a de Polignac number, because 1561439 - 2⁴ = 1561423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6359 + ... + 6599.

It is an arithmetic number, because the mean of its divisors is an integer number (116160).

2^1561439 is an apocalyptic number.

1561439 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1561439 is a deficient number, since it is larger than the sum of its proper divisors (297121).

1561439 is a wasteful number, since it uses less digits than its factorization.

1561439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302.

The product of its digits is 3240, while the sum is 29.

The square root of 1561439 is about 1249.5755279294. The cubic root of 1561439 is about 116.0134496890.

The spelling of 1561439 in words is "one million, five hundred sixty-one thousand, four hundred thirty-nine".