40387920 has 160 divisors (see below), whose sum is σ = 139812480. Its totient is φ = 9584640.

The previous prime is 40387891. The next prime is 40387927. The reversal of 40387920 is 2978304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40387927) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77260 + ... + 77780.

It is an arithmetic number, because the mean of its divisors is an integer number (873828).

Almost surely, 2^40387920 is an apocalyptic number.

40387920 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 40387920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69906240).

40387920 is an abundant number, since it is smaller than the sum of its proper divisors (99424560).

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

40387920 is a wasteful number, since it uses less digits than its factorization.

40387920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573 (or 567 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 40387920 is about 6355.1490934517. The cubic root of 40387920 is about 343.0971910203.

The spelling of 40387920 in words is "forty million, three hundred eighty-seven thousand, nine hundred twenty".