405041644 has 18 divisors (see below), whose sum is σ = 824549460. Its totient is φ = 173589192.

The previous prime is 405041641. The next prime is 405041669. The reversal of 405041644 is 446140504.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (405041641) 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 5 ways as a sum of consecutive naturals, for example, 1033074 + ... + 1033465.

Almost surely, 2^405041644 is an apocalyptic number.

It is an amenable number.

405041644 is an abundant number, since it is smaller than the sum of its proper divisors (419507816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

405041644 is a wasteful number, since it uses less digits than its factorization.

405041644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2066557 (or 2066548 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 405041644 is about 20125.6464244009. The cubic root of 405041644 is about 739.8889801796. Note that the first 3 decimals are identical.

The spelling of 405041644 in words is "four hundred five million, forty-one thousand, six hundred forty-four".