940721517 has 12 divisors (see below), whose sum is σ = 1405676220. Its totient is φ = 605521728.

The previous prime is 940721501. The next prime is 940721519. The reversal of 940721517 is 715127049.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 504496521 + 436224996 = 22461^2 + 20886^2 .

It is not a de Polignac number, because 940721517 - 2⁴ = 940721501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (940721519) 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 11 ways as a sum of consecutive naturals, for example, 1801888 + ... + 1802409.

It is an arithmetic number, because the mean of its divisors is an integer number (117139685).

Almost surely, 2^940721517 is an apocalyptic number.

It is an amenable number.

940721517 is a deficient number, since it is larger than the sum of its proper divisors (464954703).

940721517 is a wasteful number, since it uses less digits than its factorization.

940721517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3604332 (or 3604329 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The square root of 940721517 is about 30671.1838213004. The cubic root of 940721517 is about 979.8366786697.

The spelling of 940721517 in words is "nine hundred forty million, seven hundred twenty-one thousand, five hundred seventeen".