1423756509 has 16 divisors (see below), whose sum is σ = 2172938880. Its totient is φ = 812298240.

The previous prime is 1423756489. The next prime is 1423756547. The reversal of 1423756509 is 9056573241.

It is not a de Polignac number, because 1423756509 - 2⁷ = 1423756381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1423756309) 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, 39424 + ... + 66345.

It is an arithmetic number, because the mean of its divisors is an integer number (135808680).

Almost surely, 2^1423756509 is an apocalyptic number.

It is an amenable number.

1423756509 is a deficient number, since it is larger than the sum of its proper divisors (749182371).

1423756509 is a wasteful number, since it uses less digits than its factorization.

1423756509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106420.

The product of its (nonzero) digits is 226800, while the sum is 42.

The square root of 1423756509 is about 37732.6981410023. The cubic root of 1423756509 is about 1124.9811378566.

The spelling of 1423756509 in words is "one billion, four hundred twenty-three million, seven hundred fifty-six thousand, five hundred nine".