19642549400 has 48 divisors (see below), whose sum is σ = 45738534600. Its totient is φ = 7845044480.

The previous prime is 19642549397. The next prime is 19642549403. The reversal of 19642549400 is 494524691.

It is an interprime number because it is at equal distance from previous prime (19642549397) and next prime (19642549403).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19642549403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57284 + ... + 206316.

Almost surely, 2^19642549400 is an apocalyptic number.

19642549400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19642549400 is an abundant number, since it is smaller than the sum of its proper divisors (26095985200).

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

19642549400 is a wasteful number, since it uses less digits than its factorization.

19642549400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149708 (or 149699 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 19642549400 in words is "nineteen billion, six hundred forty-two million, five hundred forty-nine thousand, four hundred".