1219023947 has 4 divisors (see below), whose sum is σ = 1290731256. Its totient is φ = 1147316640.

The previous prime is 1219023937. The next prime is 1219023973. The reversal of 1219023947 is 7493209121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7493209121 = 8663 ⋅864967.

It is a cyclic number.

It is not a de Polignac number, because 1219023947 - 2¹⁴ = 1219007563 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1219023947.

It is not an unprimeable number, because it can be changed into a prime (1219023917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35853629 + ... + 35853662.

It is an arithmetic number, because the mean of its divisors is an integer number (322682814).

Almost surely, 2^1219023947 is an apocalyptic number.

1219023947 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1219023947 is a deficient number, since it is larger than the sum of its proper divisors (71707309).

1219023947 is an equidigital number, since it uses as much as digits as its factorization.

1219023947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71707308.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 1219023947 is about 34914.5234393941. The cubic root of 1219023947 is about 1068.2446973879.

The spelling of 1219023947 in words is "one billion, two hundred nineteen million, twenty-three thousand, nine hundred forty-seven".