45870021 has 12 divisors (see below), whose sum is σ = 67873260. Its totient is φ = 29833920.

The previous prime is 45870001. The next prime is 45870031. The reversal of 45870021 is 12007854.

It can be written as a sum of positive squares in 2 ways, for example, as 4730625 + 41139396 = 2175^2 + 6414^2 .

It is not a de Polignac number, because 45870021 - 2¹⁰ = 45868997 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45870001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61786 + ... + 62523.

It is an arithmetic number, because the mean of its divisors is an integer number (5656105).

Almost surely, 2^45870021 is an apocalyptic number.

45870021 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

45870021 is a deficient number, since it is larger than the sum of its proper divisors (22003239).

45870021 is a wasteful number, since it uses less digits than its factorization.

45870021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124356 (or 124353 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 45870021 is about 6772.7410256114. The cubic root of 45870021 is about 357.9669897676.

Adding to 45870021 its reverse (12007854), we get a palindrome (57877875).

The spelling of 45870021 in words is "forty-five million, eight hundred seventy thousand, twenty-one".