40107921 has 24 divisors (see below), whose sum is σ = 62528544. Its totient is φ = 22800960.

The previous prime is 40107911. The next prime is 40107923. The reversal of 40107921 is 12970104.

It is not a de Polignac number, because 40107921 - 2⁶ = 40107857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40107891 and 40107900.

It is not an unprimeable number, because it can be changed into a prime (40107923) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33666 + ... + 34836.

It is an arithmetic number, because the mean of its divisors is an integer number (2605356).

Almost surely, 2^40107921 is an apocalyptic number.

It is an amenable number.

40107921 is a deficient number, since it is larger than the sum of its proper divisors (22420623).

40107921 is a wasteful number, since it uses less digits than its factorization.

40107921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1421 (or 1414 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 40107921 is about 6333.0814774484. The cubic root of 40107921 is about 342.3024836618.

The spelling of 40107921 in words is "forty million, one hundred seven thousand, nine hundred twenty-one".