1923825139 has 4 divisors (see below), whose sum is σ = 1927681000. Its totient is φ = 1919969280.

The previous prime is 1923825121. The next prime is 1923825149. The reversal of 1923825139 is 9315283291.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9315283291 = 23 ⋅405012317.

It is a cyclic number.

It is not a de Polignac number, because 1923825139 - 2¹⁵ = 1923792371 is a prime.

It is a super-2 number, since 2×1923825139² = 7402206330896738642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1923825095 and 1923825104.

It is not an unprimeable number, because it can be changed into a prime (1923825119) 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, 1927182 + ... + 1928179.

It is an arithmetic number, because the mean of its divisors is an integer number (481920250).

Almost surely, 2^1923825139 is an apocalyptic number.

1923825139 is a deficient number, since it is larger than the sum of its proper divisors (3855861).

1923825139 is an equidigital number, since it uses as much as digits as its factorization.

1923825139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3855860.

The product of its digits is 116640, while the sum is 43.

The square root of 1923825139 is about 43861.4311098031. The cubic root of 1923825139 is about 1243.7178434857.

The spelling of 1923825139 in words is "one billion, nine hundred twenty-three million, eight hundred twenty-five thousand, one hundred thirty-nine".