40732021 has 4 divisors (see below), whose sum is σ = 44434944. Its totient is φ = 37029100.

The previous prime is 40732009. The next prime is 40732049. The reversal of 40732021 is 12023704.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40732021 - 2⁵ = 40731989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40732021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40736021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1851445 + ... + 1851466.

It is an arithmetic number, because the mean of its divisors is an integer number (11108736).

Almost surely, 2^40732021 is an apocalyptic number.

It is an amenable number.

40732021 is a deficient number, since it is larger than the sum of its proper divisors (3702923).

40732021 is a wasteful number, since it uses less digits than its factorization.

40732021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3702922.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 40732021 is about 6382.1642880766. The cubic root of 40732021 is about 344.0688212991.

Adding to 40732021 its reverse (12023704), we get a palindrome (52755725).

The spelling of 40732021 in words is "forty million, seven hundred thirty-two thousand, twenty-one".