40407840 has 144 divisors (see below), whose sum is σ = 150486336. Its totient is φ = 9792000.

The previous prime is 40407839. The next prime is 40407841. The reversal of 40407840 is 4870404.

It is an interprime number because it is at equal distance from previous prime (40407839) and next prime (40407841).

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40407841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14565 + ... + 17115.

It is an arithmetic number, because the mean of its divisors is an integer number (1045044).

Almost surely, 2^40407840 is an apocalyptic number.

40407840 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 40407840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75243168).

40407840 is an abundant number, since it is smaller than the sum of its proper divisors (110078496).

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

40407840 is a wasteful number, since it uses less digits than its factorization.

40407840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2583 (or 2572 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 40407840 is about 6356.7161333506. The cubic root of 40407840 is about 343.1535888469.

The spelling of 40407840 in words is "forty million, four hundred seven thousand, eight hundred forty".