19400039220 has 24 divisors (see below), whose sum is σ = 54320109984. Its totient is φ = 5173343776.

The previous prime is 19400039173. The next prime is 19400039221. The reversal of 19400039220 is 2293000491.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19400039221) 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, 161666934 + ... + 161667053.

It is an arithmetic number, because the mean of its divisors is an integer number (2263337916).

Almost surely, 2^19400039220 is an apocalyptic number.

19400039220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19400039220 is an abundant number, since it is smaller than the sum of its proper divisors (34920070764).

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

19400039220 is a wasteful number, since it uses less digits than its factorization.

19400039220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323333999 (or 323333997 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The spelling of 19400039220 in words is "nineteen billion, four hundred million, thirty-nine thousand, two hundred twenty".