1420665705 has 24 divisors (see below), whose sum is σ = 2464180992. Its totient is φ = 757167264.

The previous prime is 1420665683. The next prime is 1420665721. The reversal of 1420665705 is 5075660241.

It is a happy number.

1420665705 is a `hidden beast` number, since 1 + 4 + 20 + 66 + 570 + 5 = 666.

It is not a de Polignac number, because 1420665705 - 2¹² = 1420661609 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1420665705.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60442 + ... + 80588.

It is an arithmetic number, because the mean of its divisors is an integer number (102674208).

Almost surely, 2^1420665705 is an apocalyptic number.

1420665705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1420665705 is a deficient number, since it is larger than the sum of its proper divisors (1043515287).

1420665705 is a wasteful number, since it uses less digits than its factorization.

1420665705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21725 (or 21722 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 1420665705 is about 37691.7193160514. The cubic root of 1420665705 is about 1124.1664818540.

The spelling of 1420665705 in words is "one billion, four hundred twenty million, six hundred sixty-five thousand, seven hundred five".