1421817849 has 9 divisors (see below), whose sum is σ = 2053900303. Its totient is φ = 947803152.

The previous prime is 1421817847. The next prime is 1421817853. The reversal of 1421817849 is 9487181241.

The square root of 1421817849 is 37707.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1410528249 + 11289600 = 37557^2 + 3360^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1421817849 - 2¹ = 1421817847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1421817847) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 106837 + ... + 119405.

Almost surely, 2^1421817849 is an apocalyptic number.

1421817849 is the 37707-th square number.

1421817849 is the 18854-th centered octagonal number.

It is an amenable number.

1421817849 is a deficient number, since it is larger than the sum of its proper divisors (632082454).

1421817849 is an frugal number, since it uses more digits than its factorization.

1421817849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25144 (or 12572 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The cubic root of 1421817849 is about 1124.4702952209.

The spelling of 1421817849 in words is "one billion, four hundred twenty-one million, eight hundred seventeen thousand, eight hundred forty-nine".