1405650065 has 8 divisors (see below), whose sum is σ = 1690678248. Its totient is φ = 1121921280.

The previous prime is 1405650061. The next prime is 1405650131. The reversal of 1405650065 is 5600565041.

It is a Cunningham number, because it is equal to 37492²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 1405650064 = 1^2 + 37492^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1405650065 - 2² = 1405650061 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1405650061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 322466 + ... + 326795.

It is an arithmetic number, because the mean of its divisors is an integer number (211334781).

Almost surely, 2^1405650065 is an apocalyptic number.

It is an amenable number.

1405650065 is a deficient number, since it is larger than the sum of its proper divisors (285028183).

1405650065 is an equidigital number, since it uses as much as digits as its factorization.

1405650065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649699.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 1405650065 is about 37492.0000133362. Note that the first 4 decimals coincide. The cubic root of 1405650065 is about 1120.1918424036.

The spelling of 1405650065 in words is "one billion, four hundred five million, six hundred fifty thousand, sixty-five".