1400136809 has 4 divisors (see below), whose sum is σ = 1473828240. Its totient is φ = 1326445380.

The previous prime is 1400136767. The next prime is 1400136811. The reversal of 1400136809 is 9086310041.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9086310041 = 311 ⋅29216431.

It is a cyclic number.

It is not a de Polignac number, because 1400136809 - 2¹⁶ = 1400071273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1400136209) 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, 36845687 + ... + 36845724.

It is an arithmetic number, because the mean of its divisors is an integer number (368457060).

Almost surely, 2^1400136809 is an apocalyptic number.

1400136809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1400136809 is a deficient number, since it is larger than the sum of its proper divisors (73691431).

1400136809 is an equidigital number, since it uses as much as digits as its factorization.

1400136809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73691430.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 1400136809 is about 37418.4020102409. The cubic root of 1400136809 is about 1118.7253805887.

The spelling of 1400136809 in words is "one billion, four hundred million, one hundred thirty-six thousand, eight hundred nine".