19306940 has 24 divisors (see below), whose sum is σ = 40778640. Its totient is φ = 7678208.

The previous prime is 19306919. The next prime is 19306943. The reversal of 19306940 is 4960391.

19306940 = 1550² + 1551² + ... + 1557².

It is a plaindrome in base 16.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 19306897 and 19306906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19306943) 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 7 ways as a sum of consecutive naturals, for example, 884 + ... + 6276.

It is an arithmetic number, because the mean of its divisors is an integer number (1699110).

Almost surely, 2^19306940 is an apocalyptic number.

19306940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19306940 is an abundant number, since it is smaller than the sum of its proper divisors (21471700).

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

19306940 is a wasteful number, since it uses less digits than its factorization.

19306940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5581 (or 5579 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 19306940 is about 4393.9663175769. The cubic root of 19306940 is about 268.2694068190.

The spelling of 19306940 in words is "nineteen million, three hundred six thousand, nine hundred forty".