45709821 has 12 divisors (see below), whose sum is σ = 69909372. Its totient is φ = 28680576.

The previous prime is 45709819. The next prime is 45709849. The reversal of 45709821 is 12890754.

45709821 is a `hidden beast` number, since 4 + 570 + 9 + 82 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 30802500 + 14907321 = 5550^2 + 3861^2 .

It is not a de Polignac number, because 45709821 - 2¹ = 45709819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45709021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 149226 + ... + 149531.

It is an arithmetic number, because the mean of its divisors is an integer number (5825781).

Almost surely, 2^45709821 is an apocalyptic number.

It is an amenable number.

45709821 is a deficient number, since it is larger than the sum of its proper divisors (24199551).

45709821 is a wasteful number, since it uses less digits than its factorization.

45709821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298780 (or 298777 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 45709821 is about 6760.9038596921. The cubic root of 45709821 is about 357.5497731733.

The spelling of 45709821 in words is "forty-five million, seven hundred nine thousand, eight hundred twenty-one".