19661430 has 32 divisors (see below), whose sum is σ = 48465504. Its totient is φ = 5101056.

The previous prime is 19661429. The next prime is 19661443. The reversal of 19661430 is 3416691.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7747 + ... + 9966.

It is an arithmetic number, because the mean of its divisors is an integer number (1514547).

Almost surely, 2^19661430 is an apocalyptic number.

19661430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19661430 is an abundant number, since it is smaller than the sum of its proper divisors (28804074).

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

19661430 is a wasteful number, since it uses less digits than its factorization.

19661430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17760.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 19661430 is about 4434.1211079536. The cubic root of 19661430 is about 269.9013356923.

The spelling of 19661430 in words is "nineteen million, six hundred sixty-one thousand, four hundred thirty".