30640943 has 4 divisors (see below), whose sum is σ = 31219128. Its totient is φ = 30062760.

The previous prime is 30640933. The next prime is 30640949. The reversal of 30640943 is 34904603.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34904603 = 29 ⋅1203607.

It is a cyclic number.

It is not a de Polignac number, because 30640943 - 2¹⁰ = 30639919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30640949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289013 + ... + 289118.

It is an arithmetic number, because the mean of its divisors is an integer number (7804782).

Almost surely, 2^30640943 is an apocalyptic number.

30640943 is a deficient number, since it is larger than the sum of its proper divisors (578185).

30640943 is an equidigital number, since it uses as much as digits as its factorization.

30640943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578184.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 30640943 is about 5535.4261805212. The cubic root of 30640943 is about 312.9205193094.

The spelling of 30640943 in words is "thirty million, six hundred forty thousand, nine hundred forty-three".