1405649 has 4 divisors (see below), whose sum is σ = 1606464. Its totient is φ = 1204836.

The previous prime is 1405643. The next prime is 1405669. The reversal of 1405649 is 9465041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9465041 = 991 ⋅9551.

It is a cyclic number.

It is not a de Polignac number, because 1405649 - 2¹⁶ = 1340113 is a prime.

It is a super-2 number, since 2×1405649² = 3951698222402, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1405643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100397 + ... + 100410.

It is an arithmetic number, because the mean of its divisors is an integer number (401616).

2^1405649 is an apocalyptic number.

It is an amenable number.

1405649 is a deficient number, since it is larger than the sum of its proper divisors (200815).

1405649 is an equidigital number, since it uses as much as digits as its factorization.

1405649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200814.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1405649 is about 1185.6006916327. The cubic root of 1405649 is about 112.0191559497.

The spelling of 1405649 in words is "one million, four hundred five thousand, six hundred forty-nine".