19197940240 has 40 divisors (see below), whose sum is σ = 44652653208. Its totient is φ = 7676175360.

The previous prime is 19197940193. The next prime is 19197940241. The reversal of 19197940240 is 4204979191.

It can be written as a sum of positive squares in 4 ways, for example, as 149523984 + 19048416256 = 12228^2 + 138016^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×19197940240² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19197940241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165070 + ... + 256210.

Almost surely, 2^19197940240 is an apocalyptic number.

19197940240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19197940240 is an abundant number, since it is smaller than the sum of its proper divisors (25454712968).

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

19197940240 is a wasteful number, since it uses less digits than its factorization.

19197940240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93787 (or 93781 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 46.

The spelling of 19197940240 in words is "nineteen billion, one hundred ninety-seven million, nine hundred forty thousand, two hundred forty".