1421705747 has 12 divisors (see below), whose sum is σ = 1804169016. Its totient is φ = 1107822240.

The previous prime is 1421705741. The next prime is 1421705819. The reversal of 1421705747 is 7475071241.

It is a de Polignac number, because none of the positive numbers 2^k-1421705747 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1421705747.

It is not an unprimeable number, because it can be changed into a prime (1421705741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1318298 + ... + 1319375.

It is an arithmetic number, because the mean of its divisors is an integer number (150347418).

Almost surely, 2^1421705747 is an apocalyptic number.

1421705747 is a deficient number, since it is larger than the sum of its proper divisors (382463269).

1421705747 is a wasteful number, since it uses less digits than its factorization.

1421705747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2637698 (or 2637691 counting only the distinct ones).

The product of its (nonzero) digits is 54880, while the sum is 38.

The square root of 1421705747 is about 37705.5134827786. The cubic root of 1421705747 is about 1124.4407418146.

Adding to 1421705747 its reverse (7475071241), we get a palindrome (8896776988).

The spelling of 1421705747 in words is "one billion, four hundred twenty-one million, seven hundred five thousand, seven hundred forty-seven".