19431802404 has 81 divisors (see below), whose sum is σ = 57155973147. Its totient is φ = 5550270768.

The previous prime is 19431802373. The next prime is 19431802409. The reversal of 19431802404 is 40420813491.

It is a happy number.

The square root of 19431802404 is 139398.

It is a perfect power (a square), and thus also a powerful number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (19431802409) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5853057 + ... + 5856375.

Almost surely, 2^19431802404 is an apocalyptic number.

19431802404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

19431802404 is the 139398-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19431802404

19431802404 is an abundant number, since it is smaller than the sum of its proper divisors (37724170743).

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

19431802404 is an equidigital number, since it uses as much as digits as its factorization.

19431802404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6662 (or 3331 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

Multiplying 19431802404 by its sum of digits (36), we get a square (699544886544 = 836388²).

19431802404 divided by its sum of digits (36) gives a square (539772289 = 23233²).

The spelling of 19431802404 in words is "nineteen billion, four hundred thirty-one million, eight hundred two thousand, four hundred four".