1821434697 has 12 divisors (see below), whose sum is σ = 2721684420. Its totient is φ = 1172417568.

The previous prime is 1821434687. The next prime is 1821434701. The reversal of 1821434697 is 7964341281.

1821434697 is a `hidden beast` number, since 1 + 8 + 214 + 346 + 97 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1035809856 + 785624841 = 32184^2 + 28029^2 .

It is not a de Polignac number, because 1821434697 - 2¹⁰ = 1821433673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1821434647) 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, 3489078 + ... + 3489599.

It is an arithmetic number, because the mean of its divisors is an integer number (226807035).

Almost surely, 2^1821434697 is an apocalyptic number.

It is an amenable number.

1821434697 is a deficient number, since it is larger than the sum of its proper divisors (900249723).

1821434697 is a wasteful number, since it uses less digits than its factorization.

1821434697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6978712 (or 6978709 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 1821434697 is about 42678.2696111265. The cubic root of 1821434697 is about 1221.2498829545.

The spelling of 1821434697 in words is "one billion, eight hundred twenty-one million, four hundred thirty-four thousand, six hundred ninety-seven".