405890449 has 4 divisors (see below), whose sum is σ = 414526464. Its totient is φ = 397254436.

The previous prime is 405890437. The next prime is 405890461. The reversal of 405890449 is 944098504.

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.

It is an interprime number because it is at equal distance from previous prime (405890437) and next prime (405890461).

It is a cyclic number.

It is not a de Polignac number, because 405890449 - 2⁷ = 405890321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (405890479) 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, 4317937 + ... + 4318030.

It is an arithmetic number, because the mean of its divisors is an integer number (103631616).

Almost surely, 2^405890449 is an apocalyptic number.

It is an amenable number.

405890449 is a deficient number, since it is larger than the sum of its proper divisors (8636015).

405890449 is an equidigital number, since it uses as much as digits as its factorization.

405890449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8636014.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 405890449 is about 20146.7230337839. The cubic root of 405890449 is about 740.4054565233.

The spelling of 405890449 in words is "four hundred five million, eight hundred ninety thousand, four hundred forty-nine".