1405621 has 8 divisors (see below), whose sum is σ = 1617920. Its totient is φ = 1196208.

The previous prime is 1405597. The next prime is 1405631. The reversal of 1405621 is 1265041.

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

It is a cyclic number.

It is not a de Polignac number, because 1405621 - 2⁷ = 1405493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1405631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 460 + ... + 1738.

It is an arithmetic number, because the mean of its divisors is an integer number (202240).

2^1405621 is an apocalyptic number.

1405621 is the 685-th hex number.

It is an amenable number.

1405621 is a deficient number, since it is larger than the sum of its proper divisors (212299).

1405621 is a wasteful number, since it uses less digits than its factorization.

1405621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1405621 is about 1185.5888832137. The cubic root of 1405621 is about 112.0184121516.

The spelling of 1405621 in words is "one million, four hundred five thousand, six hundred twenty-one".