40819440 has 40 divisors (see below), whose sum is σ = 126541008. Its totient is φ = 10885120.

The previous prime is 40819423. The next prime is 40819447. The reversal of 40819440 is 4491804.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 40819398 and 40819407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40819447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84801 + ... + 85280.

Almost surely, 2^40819440 is an apocalyptic number.

40819440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40819440 is an abundant number, since it is smaller than the sum of its proper divisors (85721568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40819440 is a wasteful number, since it uses less digits than its factorization.

40819440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170097 (or 170091 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 40819440 is about 6389.0093128747. The cubic root of 40819440 is about 344.3147920716.

The spelling of 40819440 in words is "forty million, eight hundred nineteen thousand, four hundred forty".