40499440 has 80 divisors (see below), whose sum is σ = 101056032. Its totient is φ = 15040512.

The previous prime is 40499419. The next prime is 40499441. The reversal of 40499440 is 4499404.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 40499396 and 40499405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40499441) 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, 131767 + ... + 132073.

Almost surely, 2^40499440 is an apocalyptic number.

40499440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40499440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50528016).

40499440 is an abundant number, since it is smaller than the sum of its proper divisors (60556592).

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

40499440 is a wasteful number, since it uses less digits than its factorization.

40499440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434 (or 428 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 40499440 is about 6363.9170327716. The cubic root of 40499440 is about 343.4126899439.

The spelling of 40499440 in words is "forty million, four hundred ninety-nine thousand, four hundred forty".