19400138 has 8 divisors (see below), whose sum is σ = 29777088. Its totient is φ = 9474444.

The previous prime is 19400113. The next prime is 19400149. The reversal of 19400138 is 83100491.

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

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, 112706 + ... + 112877.

It is an arithmetic number, because the mean of its divisors is an integer number (3722136).

Almost surely, 2^19400138 is an apocalyptic number.

19400138 is a deficient number, since it is larger than the sum of its proper divisors (10376950).

19400138 is a wasteful number, since it uses less digits than its factorization.

19400138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225628.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 19400138 is about 4404.5587747242. The cubic root of 19400138 is about 268.7003753335.

The spelling of 19400138 in words is "nineteen million, four hundred thousand, one hundred thirty-eight".