405443997 has 24 divisors (see below), whose sum is σ = 675941760. Its totient is φ = 229384800.

The previous prime is 405443989. The next prime is 405444077. The reversal of 405443997 is 799344504.

It is a happy number.

It is not a de Polignac number, because 405443997 - 2³ = 405443989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405447997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25497 + ... + 38222.

It is an arithmetic number, because the mean of its divisors is an integer number (28164240).

Almost surely, 2^405443997 is an apocalyptic number.

It is an amenable number.

405443997 is a deficient number, since it is larger than the sum of its proper divisors (270497763).

405443997 is a wasteful number, since it uses less digits than its factorization.

405443997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63833 (or 63830 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The square root of 405443997 is about 20135.6399699637. The cubic root of 405443997 is about 740.1338916482.

The spelling of 405443997 in words is "four hundred five million, four hundred forty-three thousand, nine hundred ninety-seven".