40446405 has 16 divisors (see below), whose sum is σ = 71904960. Its totient is φ = 21571344.

The previous prime is 40446361. The next prime is 40446409. The reversal of 40446405 is 50464404.

It is not a de Polignac number, because 40446405 - 2¹⁶ = 40380869 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40446409) 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, 149667 + ... + 149936.

It is an arithmetic number, because the mean of its divisors is an integer number (4494060).

Almost surely, 2^40446405 is an apocalyptic number.

40446405 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40446405 is a deficient number, since it is larger than the sum of its proper divisors (31458555).

40446405 is a wasteful number, since it uses less digits than its factorization.

40446405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299617 (or 299611 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 40446405 is about 6359.7488157945. The cubic root of 40446405 is about 343.2627220442.

The spelling of 40446405 in words is "forty million, four hundred forty-six thousand, four hundred five".