1974816139 has 4 divisors (see below), whose sum is σ = 1975752856. Its totient is φ = 1973879424.

The previous prime is 1974816083. The next prime is 1974816163. The reversal of 1974816139 is 9316184791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9316184791 = 499 ⋅18669709.

It is a cyclic number.

It is not a de Polignac number, because 1974816139 - 2¹¹ = 1974814091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1974816092 and 1974816101.

It is not an unprimeable number, because it can be changed into a prime (1974876139) 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, 465189 + ... + 469414.

It is an arithmetic number, because the mean of its divisors is an integer number (493938214).

Almost surely, 2^1974816139 is an apocalyptic number.

1974816139 is a deficient number, since it is larger than the sum of its proper divisors (936717).

1974816139 is an equidigital number, since it uses as much as digits as its factorization.

1974816139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936716.

The product of its digits is 326592, while the sum is 49.

The square root of 1974816139 is about 44438.9034405666. The cubic root of 1974816139 is about 1254.6104173220.

The spelling of 1974816139 in words is "one billion, nine hundred seventy-four million, eight hundred sixteen thousand, one hundred thirty-nine".