19139890 has 96 divisors (see below), whose sum is σ = 45209664. Its totient is φ = 5765760.

The previous prime is 19139863. The next prime is 19139891. The reversal of 19139890 is 9893191.

It is not an unprimeable number, because it can be changed into a prime (19139891) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 285637 + ... + 285703.

It is an arithmetic number, because the mean of its divisors is an integer number (470934).

Almost surely, 2^19139890 is an apocalyptic number.

19139890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19139890 is an abundant number, since it is smaller than the sum of its proper divisors (26069774).

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

19139890 is a wasteful number, since it uses less digits than its factorization.

19139890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 40.

The square root of 19139890 is about 4374.9159991936. The cubic root of 19139890 is about 267.4934461375.

The spelling of 19139890 in words is "nineteen million, one hundred thirty-nine thousand, eight hundred ninety".