19439948902 has 16 divisors (see below), whose sum is σ = 33682051152. Its totient is φ = 8316555520.

The previous prime is 19439948861. The next prime is 19439948909. The reversal of 19439948902 is 20984993491.

It is a super-2 number, since 2×19439948902² (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 (19439948909) 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, 25988863 + ... + 25989610.

It is an arithmetic number, because the mean of its divisors is an integer number (2105128197).

Almost surely, 2^19439948902 is an apocalyptic number.

19439948902 is a deficient number, since it is larger than the sum of its proper divisors (14242102250).

19439948902 is a wasteful number, since it uses less digits than its factorization.

19439948902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51978503.

The product of its (nonzero) digits is 5038848, while the sum is 58.

The spelling of 19439948902 in words is "nineteen billion, four hundred thirty-nine million, nine hundred forty-eight thousand, nine hundred two".