19198940 has 12 divisors (see below), whose sum is σ = 40317816. Its totient is φ = 7679568.

The previous prime is 19198939. The next prime is 19198943. The reversal of 19198940 is 4989191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19198943) 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, 479954 + ... + 479993.

It is an arithmetic number, because the mean of its divisors is an integer number (3359818).

Almost surely, 2^19198940 is an apocalyptic number.

19198940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19198940 is an abundant number, since it is smaller than the sum of its proper divisors (21118876).

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

19198940 is a wasteful number, since it uses less digits than its factorization.

19198940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959956 (or 959954 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 19198940 is about 4381.6595029737. The cubic root of 19198940 is about 267.7682521719.

The spelling of 19198940 in words is "nineteen million, one hundred ninety-eight thousand, nine hundred forty".