1661426 has 8 divisors (see below), whose sum is σ = 2683884. Its totient is φ = 766800.

The previous prime is 1661353. The next prime is 1661431. The reversal of 1661426 is 6241661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1651225 + 10201 = 1285^2 + 101^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 63901 = 1661426 / (1 + 6 + 6 + 1 + 4 + 2 + 6).

It is a junction number, because it is equal to n+sod(n) for n = 1661395 and 1661404.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31925 + ... + 31976.

2^1661426 is an apocalyptic number.

1661426 is a deficient number, since it is larger than the sum of its proper divisors (1022458).

1661426 is a wasteful number, since it uses less digits than its factorization.

1661426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63916.

The product of its digits is 1728, while the sum is 26.

The square root of 1661426 is about 1288.9631492017. The cubic root of 1661426 is about 118.4387097223.

The spelling of 1661426 in words is "one million, six hundred sixty-one thousand, four hundred twenty-six".