19418940 has 60 divisors (see below), whose sum is σ = 60923016. Its totient is φ = 5177952.

The previous prime is 19418939. The next prime is 19418941. The reversal of 19418940 is 4981491.

It is an interprime number because it is at equal distance from previous prime (19418939) and next prime (19418941).

It is a tau number, because it is divible by the number of its divisors (60).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 19418895 and 19418904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19418941) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4374 + ... + 7613.

Almost surely, 2^19418940 is an apocalyptic number.

19418940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19418940 is an abundant number, since it is smaller than the sum of its proper divisors (41504076).

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

19418940 is a wasteful number, since it uses less digits than its factorization.

19418940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12008 (or 11997 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 19418940 is about 4406.6926373415. The cubic root of 19418940 is about 268.7871526066.

The spelling of 19418940 in words is "nineteen million, four hundred eighteen thousand, nine hundred forty".