19409597400 has 96 divisors (see below), whose sum is σ = 60327567360. Its totient is φ = 5162317440.

The previous prime is 19409597399. The next prime is 19409597419. The reversal of 19409597400 is 479590491.

It is a self number, because there is not a number n which added to its sum of digits gives 19409597400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 187569 + ... + 272031.

It is an arithmetic number, because the mean of its divisors is an integer number (628412160).

Almost surely, 2^19409597400 is an apocalyptic number.

19409597400 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 19409597400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30163783680).

19409597400 is an abundant number, since it is smaller than the sum of its proper divisors (40917969960).

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

19409597400 is a wasteful number, since it uses less digits than its factorization.

19409597400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84865 (or 84856 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 48.

The spelling of 19409597400 in words is "nineteen billion, four hundred nine million, five hundred ninety-seven thousand, four hundred".