1209799423 has 16 divisors (see below), whose sum is σ = 1430985024. Its totient is φ = 1001226240.

The previous prime is 1209799421. The next prime is 1209799469. The reversal of 1209799423 is 3249979021.

It is a happy number.

It is not a de Polignac number, because 1209799423 - 2¹ = 1209799421 is a prime.

It is a super-2 number, since 2×1209799423² = 2927229287782265858, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209799421) 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, 6111 + ... + 49567.

It is an arithmetic number, because the mean of its divisors is an integer number (89436564).

Almost surely, 2^1209799423 is an apocalyptic number.

1209799423 is a deficient number, since it is larger than the sum of its proper divisors (221185601).

1209799423 is an equidigital number, since it uses as much as digits as its factorization.

1209799423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43602.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 1209799423 is about 34782.1710506978. The cubic root of 1209799423 is about 1065.5433532650.

The spelling of 1209799423 in words is "one billion, two hundred nine million, seven hundred ninety-nine thousand, four hundred twenty-three".