40345221 has 32 divisors (see below), whose sum is σ = 63221760. Its totient is φ = 22411584.

The previous prime is 40345219. The next prime is 40345231. The reversal of 40345221 is 12254304.

It is not a de Polignac number, because 40345221 - 2¹ = 40345219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40345231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137551 + ... + 137843.

It is an arithmetic number, because the mean of its divisors is an integer number (1975680).

Almost surely, 2^40345221 is an apocalyptic number.

It is an amenable number.

40345221 is a deficient number, since it is larger than the sum of its proper divisors (22876539).

40345221 is a wasteful number, since it uses less digits than its factorization.

40345221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 40345221 is about 6351.7888031640. The cubic root of 40345221 is about 342.9762384126.

Adding to 40345221 its reverse (12254304), we get a palindrome (52599525).

The spelling of 40345221 in words is "forty million, three hundred forty-five thousand, two hundred twenty-one".