19408420 has 12 divisors (see below), whose sum is σ = 40757724. Its totient is φ = 7763360.

The previous prime is 19408399. The next prime is 19408421. The reversal of 19408420 is 2480491.

It can be written as a sum of positive squares in 2 ways, for example, as 15303744 + 4104676 = 3912^2 + 2026^2 .

It is not an unprimeable number, because it can be changed into a prime (19408421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485191 + ... + 485230.

It is an arithmetic number, because the mean of its divisors is an integer number (3396477).

Almost surely, 2^19408420 is an apocalyptic number.

19408420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19408420 is an abundant number, since it is smaller than the sum of its proper divisors (21349304).

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

19408420 is a wasteful number, since it uses less digits than its factorization.

19408420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970430 (or 970428 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 19408420 is about 4405.4988366813. The cubic root of 19408420 is about 268.7386063315.

The spelling of 19408420 in words is "nineteen million, four hundred eight thousand, four hundred twenty".