19438447740 has 24 divisors (see below), whose sum is σ = 54427653840. Its totient is φ = 5183586048.

The previous prime is 19438447709. The next prime is 19438447741. The reversal of 19438447740 is 4774483491.

It is a super-2 number, since 2×19438447740² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19438447741) 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, 161987005 + ... + 161987124.

It is an arithmetic number, because the mean of its divisors is an integer number (2267818910).

Almost surely, 2^19438447740 is an apocalyptic number.

19438447740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19438447740 is an abundant number, since it is smaller than the sum of its proper divisors (34989206100).

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

19438447740 is a wasteful number, since it uses less digits than its factorization.

19438447740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323974141 (or 323974139 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 51.

The spelling of 19438447740 in words is "nineteen billion, four hundred thirty-eight million, four hundred forty-seven thousand, seven hundred forty".