1400839809 has 16 divisors (see below), whose sum is σ = 2033889600. Its totient is φ = 854231616.

The previous prime is 1400839799. The next prime is 1400839813. The reversal of 1400839809 is 9089380041.

It is not a de Polignac number, because 1400839809 - 2⁵ = 1400839777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1400839849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 422074 + ... + 425379.

It is an arithmetic number, because the mean of its divisors is an integer number (127118100).

Almost surely, 2^1400839809 is an apocalyptic number.

1400839809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1400839809 is a deficient number, since it is larger than the sum of its proper divisors (633049791).

1400839809 is a wasteful number, since it uses less digits than its factorization.

1400839809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847504.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 1400839809 is about 37427.7946050793. The cubic root of 1400839809 is about 1118.9125842838.

The spelling of 1400839809 in words is "one billion, four hundred million, eight hundred thirty-nine thousand, eight hundred nine".