940208009 has 6 divisors (see below), whose sum is σ = 1018095246. Its totient is φ = 867884160.

The previous prime is 940207997. The next prime is 940208033. The reversal of 940208009 is 900802049.

It can be written as a sum of positive squares in 3 ways, for example, as 64048009 + 876160000 = 8003^2 + 29600^2 .

It is not a de Polignac number, because 940208009 - 2²⁸ = 671772553 is a prime.

It is a super-2 number, since 2×940208009² = 1767982200375488162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (940208039) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2781512 + ... + 2781849.

It is an arithmetic number, because the mean of its divisors is an integer number (169682541).

Almost surely, 2^940208009 is an apocalyptic number.

It is an amenable number.

940208009 is a deficient number, since it is larger than the sum of its proper divisors (77887237).

940208009 is a wasteful number, since it uses less digits than its factorization.

940208009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5563387 (or 5563374 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 940208009 is about 30662.8114986216. The cubic root of 940208009 is about 979.6583596726.

The spelling of 940208009 in words is "nine hundred forty million, two hundred eight thousand, nine".