40445421 has 16 divisors (see below), whose sum is σ = 56506368. Its totient is φ = 25700400.

The previous prime is 40445417. The next prime is 40445437. The reversal of 40445421 is 12454404.

It is a happy number.

It is not a de Polignac number, because 40445421 - 2² = 40445417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40445391 and 40445400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40445491) 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, 2986 + ... + 9476.

It is an arithmetic number, because the mean of its divisors is an integer number (3531648).

Almost surely, 2^40445421 is an apocalyptic number.

It is an amenable number.

40445421 is a deficient number, since it is larger than the sum of its proper divisors (16060947).

40445421 is a wasteful number, since it uses less digits than its factorization.

40445421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6592.

The product of its (nonzero) digits is 2560, while the sum is 24.

The square root of 40445421 is about 6359.6714537781. The cubic root of 40445421 is about 343.2599383336.

Adding to 40445421 its reverse (12454404), we get a palindrome (52899825).

The spelling of 40445421 in words is "forty million, four hundred forty-five thousand, four hundred twenty-one".