1561426 has 8 divisors (see below), whose sum is σ = 2349900. Its totient is φ = 778128.

The previous prime is 1561423. The next prime is 1561429. The reversal of 1561426 is 6241651.

It is an interprime number because it is at equal distance from previous prime (1561423) and next prime (1561429).

It can be written as a sum of positive squares in 2 ways, for example, as 1442401 + 119025 = 1201^2 + 345^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1561426.

It is not an unprimeable number, because it can be changed into a prime (1561421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 421 + ... + 1816.

2^1561426 is an apocalyptic number.

1561426 is a deficient number, since it is larger than the sum of its proper divisors (788474).

1561426 is a wasteful number, since it uses less digits than its factorization.

1561426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2588.

The product of its digits is 1440, while the sum is 25.

The square root of 1561426 is about 1249.5703261522. The cubic root of 1561426 is about 116.0131277255.

The spelling of 1561426 in words is "one million, five hundred sixty-one thousand, four hundred twenty-six".