40182921 has 9 divisors (see below), whose sum is σ = 58069479. Its totient is φ = 26775936.

The previous prime is 40182907. The next prime is 40182931. The reversal of 40182921 is 12928104.

The square root of 40182921 is 6339.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 38025 + 40144896 = 195^2 + 6336^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 40182921 - 2⁵ = 40182889 is a prime.

It is a super-2 number, since 2×40182921² = 3229334280184482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40182931) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 17961 + ... + 20073.

Almost surely, 2^40182921 is an apocalyptic number.

40182921 is the 6339-th square number.

40182921 is the 3170-th centered octagonal number.

It is an amenable number.

40182921 is a deficient number, since it is larger than the sum of its proper divisors (17886558).

40182921 is an frugal number, since it uses more digits than its factorization.

40182921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4232 (or 2116 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The cubic root of 40182921 is about 342.5157141990.

The spelling of 40182921 in words is "forty million, one hundred eighty-two thousand, nine hundred twenty-one".