445653021 has 16 divisors (see below), whose sum is σ = 649062720. Its totient is φ = 269742720.

The previous prime is 445652981. The next prime is 445653029. The reversal of 445653021 is 120356544.

It is not a de Polignac number, because 445653021 - 2⁶ = 445652957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 445653021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445653029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18351 + ... + 35043.

It is an arithmetic number, because the mean of its divisors is an integer number (40566420).

Almost surely, 2^445653021 is an apocalyptic number.

It is an amenable number.

445653021 is a deficient number, since it is larger than the sum of its proper divisors (203409699).

445653021 is a wasteful number, since it uses less digits than its factorization.

445653021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17516.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 445653021 is about 21110.4955176329. The cubic root of 445653021 is about 763.8339396994.

It can be divided in two parts, 44565 and 3021, that added together give a triangular number (47586 = T₃₀₈).

The spelling of 445653021 in words is "four hundred forty-five million, six hundred fifty-three thousand, twenty-one".