40821145 has 8 divisors (see below), whose sum is σ = 50027904. Its totient is φ = 31961904.

The previous prime is 40821133. The next prime is 40821161. The reversal of 40821145 is 54112804.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40821145 - 2¹³ = 40812953 is a prime.

It is a super-2 number, since 2×40821145² = 3332731758222050, which contains 22 as substring.

It is a Duffinian 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, 86619 + ... + 87088.

It is an arithmetic number, because the mean of its divisors is an integer number (6253488).

Almost surely, 2^40821145 is an apocalyptic number.

It is an amenable number.

40821145 is a deficient number, since it is larger than the sum of its proper divisors (9206759).

40821145 is a wasteful number, since it uses less digits than its factorization.

40821145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173759.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 40821145 is about 6389.1427437490. The cubic root of 40821145 is about 344.3195859357.

Adding to 40821145 its reverse (54112804), we get a palindrome (94933949).

The spelling of 40821145 in words is "forty million, eight hundred twenty-one thousand, one hundred forty-five".