40206720 has 128 divisors (see below), whose sum is σ = 131408640. Its totient is φ = 10450944.

The previous prime is 40206709. The next prime is 40206811. The reversal of 40206720 is 2760204.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82317 + ... + 82803.

It is an arithmetic number, because the mean of its divisors is an integer number (1026630).

Almost surely, 2^40206720 is an apocalyptic number.

40206720 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 40206720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65704320).

40206720 is an abundant number, since it is smaller than the sum of its proper divisors (91201920).

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

40206720 is a wasteful number, since it uses less digits than its factorization.

40206720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552 (or 540 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 40206720 is about 6340.8769109643. The cubic root of 40206720 is about 342.5833210538.

Adding to 40206720 its reverse (2760204), we get a palindrome (42966924).

The spelling of 40206720 in words is "forty million, two hundred six thousand, seven hundred twenty".