19400830 has 8 divisors (see below), whose sum is σ = 34921512. Its totient is φ = 7760328.

The previous prime is 19400819. The next prime is 19400851. The reversal of 19400830 is 3800491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 19400795 and 19400804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 970032 + ... + 970051.

It is an arithmetic number, because the mean of its divisors is an integer number (4365189).

Almost surely, 2^19400830 is an apocalyptic number.

19400830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19400830 is a deficient number, since it is larger than the sum of its proper divisors (15520682).

19400830 is a wasteful number, since it uses less digits than its factorization.

19400830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940090.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 19400830 is about 4404.6373289977. The cubic root of 19400830 is about 268.7035701295.

The spelling of 19400830 in words is "nineteen million, four hundred thousand, eight hundred thirty".