18912340 has 24 divisors (see below), whose sum is σ = 40007520. Its totient is φ = 7509408.

The previous prime is 18912337. The next prime is 18912343. The reversal of 18912340 is 4321981.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18912337) and next prime (18912343).

It is a junction number, because it is equal to n+sod(n) for n = 18912299 and 18912308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18912343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 622 + ... + 6181.

It is an arithmetic number, because the mean of its divisors is an integer number (1666980).

Almost surely, 2^18912340 is an apocalyptic number.

18912340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18912340 is an abundant number, since it is smaller than the sum of its proper divisors (21095180).

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

18912340 is a wasteful number, since it uses less digits than its factorization.

18912340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6951 (or 6949 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 18912340 is about 4348.8320271080. The cubic root of 18912340 is about 266.4291600554.

The spelling of 18912340 in words is "eighteen million, nine hundred twelve thousand, three hundred forty".