19979460 has 72 divisors (see below), whose sum is σ = 62864256. Its totient is φ = 5326560.

The previous prime is 19979459. The next prime is 19979473. The reversal of 19979460 is 6497991.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2805 + ... + 6915.

Almost surely, 2^19979460 is an apocalyptic number.

19979460 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 19979460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31432128).

19979460 is an abundant number, since it is smaller than the sum of its proper divisors (42884796).

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

19979460 is a wasteful number, since it uses less digits than its factorization.

19979460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4135 (or 4121 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 19979460 is about 4469.8389232723. The cubic root of 19979460 is about 271.3488062674.

The spelling of 19979460 in words is "nineteen million, nine hundred seventy-nine thousand, four hundred sixty".