40740921 has 64 divisors (see below), whose sum is σ = 70560000. Its totient is φ = 23016960.

The previous prime is 40740877. The next prime is 40740967. The reversal of 40740921 is 12904704.

It is a happy number.

40740921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40740921 - 2⁷ = 40740793 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (40740991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 273355 + ... + 273503.

It is an arithmetic number, because the mean of its divisors is an integer number (1102500).

Almost surely, 2^40740921 is an apocalyptic number.

40740921 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

40740921 is a deficient number, since it is larger than the sum of its proper divisors (29819079).

40740921 is a wasteful number, since it uses less digits than its factorization.

40740921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231 (or 225 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 40740921 is about 6382.8615056258. The cubic root of 40740921 is about 344.0938793036.

It can be divided in two parts, 407 and 40921, that added together give a triangular number (41328 = T₂₈₇).

The spelling of 40740921 in words is "forty million, seven hundred forty thousand, nine hundred twenty-one".