1406621 has 4 divisors (see below), whose sum is σ = 1412892. Its totient is φ = 1400352.

The previous prime is 1406617. The next prime is 1406633. The reversal of 1406621 is 1266041.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 280900 + 1125721 = 530^2 + 1061^2 .

It is a cyclic number.

It is not a de Polignac number, because 1406621 - 2² = 1406617 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 1406593 and 1406602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1406651) 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 3 ways as a sum of consecutive naturals, for example, 2786 + ... + 3251.

It is an arithmetic number, because the mean of its divisors is an integer number (353223).

2^1406621 is an apocalyptic number.

It is an amenable number.

1406621 is a deficient number, since it is larger than the sum of its proper divisors (6271).

1406621 is an equidigital number, since it uses as much as digits as its factorization.

1406621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6270.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1406621 is about 1186.0105395822. The cubic root of 1406621 is about 112.0449702489.

The spelling of 1406621 in words is "one million, four hundred six thousand, six hundred twenty-one".