40521820 has 12 divisors (see below), whose sum is σ = 85095864. Its totient is φ = 16208720.

The previous prime is 40521799. The next prime is 40521823. The reversal of 40521820 is 2812504.

It is a super-2 number, since 2×40521820² = 3284035792224800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40521791 and 40521800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40521823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1013026 + ... + 1013065.

It is an arithmetic number, because the mean of its divisors is an integer number (7091322).

Almost surely, 2^40521820 is an apocalyptic number.

It is an amenable number.

40521820 is an abundant number, since it is smaller than the sum of its proper divisors (44574044).

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

40521820 is a wasteful number, since it uses less digits than its factorization.

40521820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2026100 (or 2026098 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 40521820 is about 6365.6751409415. The cubic root of 40521820 is about 343.4759349399.

The spelling of 40521820 in words is "forty million, five hundred twenty-one thousand, eight hundred twenty".