31840640430 has 32 divisors (see below), whose sum is σ = 78194692224. Its totient is φ = 8293375776.

The previous prime is 31840640411. The next prime is 31840640431. The reversal of 31840640430 is 3404604813.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31840640391 and 31840640400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31840640431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12340044 + ... + 12342623.

It is an arithmetic number, because the mean of its divisors is an integer number (2443584132).

Almost surely, 2^31840640430 is an apocalyptic number.

31840640430 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31840640430 is an abundant number, since it is smaller than the sum of its proper divisors (46354051794).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31840640430 is a wasteful number, since it uses less digits than its factorization.

31840640430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24682720.

The product of its (nonzero) digits is 27648, while the sum is 33.

The spelling of 31840640430 in words is "thirty-one billion, eight hundred forty million, six hundred forty thousand, four hundred thirty".