19139399 has 16 divisors (see below), whose sum is σ = 20886336. Its totient is φ = 17472000.

The previous prime is 19139383. The next prime is 19139437. The reversal of 19139399 is 99393191.

It is a cyclic number.

It is not a de Polignac number, because 19139399 - 2⁴ = 19139383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19139999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121829 + ... + 121985.

It is an arithmetic number, because the mean of its divisors is an integer number (1305396).

Almost surely, 2^19139399 is an apocalyptic number.

19139399 is a deficient number, since it is larger than the sum of its proper divisors (1746937).

19139399 is a wasteful number, since it uses less digits than its factorization.

19139399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346.

The product of its digits is 59049, while the sum is 44.

The square root of 19139399 is about 4374.8598834706. The cubic root of 19139399 is about 267.4911587610.

The spelling of 19139399 in words is "nineteen million, one hundred thirty-nine thousand, three hundred ninety-nine".