445421390 has 16 divisors (see below), whose sum is σ = 814903200. Its totient is φ = 175247520.

The previous prime is 445421363. The next prime is 445421447. The reversal of 445421390 is 93124544.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364490 + ... + 365709.

It is an arithmetic number, because the mean of its divisors is an integer number (50931450).

Almost surely, 2^445421390 is an apocalyptic number.

445421390 is a deficient number, since it is larger than the sum of its proper divisors (369481810).

445421390 is a wasteful number, since it uses less digits than its factorization.

445421390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730267.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 445421390 is about 21105.0086472382. The cubic root of 445421390 is about 763.7015809114.

The spelling of 445421390 in words is "four hundred forty-five million, four hundred twenty-one thousand, three hundred ninety".