19490940 has 144 divisors (see below), whose sum is σ = 69888000. Its totient is φ = 4302720.

The previous prime is 19490923. The next prime is 19490957. The reversal of 19490940 is 4909491.

It is an interprime number because it is at equal distance from previous prime (19490923) and next prime (19490957).

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 = 19490895 and 19490904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38811 + ... + 39309.

Almost surely, 2^19490940 is an apocalyptic number.

19490940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19490940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34944000).

19490940 is an abundant number, since it is smaller than the sum of its proper divisors (50397060).

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

19490940 is a wasteful number, since it uses less digits than its factorization.

19490940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552 (or 547 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 19490940 is about 4414.8544709877. The cubic root of 19490940 is about 269.1189387568.

The spelling of 19490940 in words is "nineteen million, four hundred ninety thousand, nine hundred forty".