40421520 has 120 divisors (see below), whose sum is σ = 140205312. Its totient is φ = 10425600.

The previous prime is 40421519. The next prime is 40421533. The reversal of 40421520 is 2512404.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×40421520² = 3267798558220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 40421493 and 40421502.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21415 + ... + 23225.

Almost surely, 2^40421520 is an apocalyptic number.

40421520 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 40421520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70102656).

40421520 is an abundant number, since it is smaller than the sum of its proper divisors (99783792).

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

40421520 is a wasteful number, since it uses less digits than its factorization.

40421520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1861 (or 1852 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 40421520 is about 6357.7920695789. The cubic root of 40421520 is about 343.1923091500.

Adding to 40421520 its reverse (2512404), we get a palindrome (42933924).

The spelling of 40421520 in words is "forty million, four hundred twenty-one thousand, five hundred twenty".