1006897821 has 8 divisors (see below), whose sum is σ = 1355565120. Its totient is φ = 664747872.

The previous prime is 1006897819. The next prime is 1006897823. The reversal of 1006897821 is 1287986001.

It is an interprime number because it is at equal distance from previous prime (1006897819) and next prime (1006897823).

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

It is not a de Polignac number, because 1006897821 - 2¹ = 1006897819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1006897823) 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, 1628976 + ... + 1629593.

It is an arithmetic number, because the mean of its divisors is an integer number (169445640).

Almost surely, 2^1006897821 is an apocalyptic number.

It is an amenable number.

1006897821 is a deficient number, since it is larger than the sum of its proper divisors (348667299).

1006897821 is a wasteful number, since it uses less digits than its factorization.

1006897821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3258675.

The product of its (nonzero) digits is 48384, while the sum is 42.

The square root of 1006897821 is about 31731.6532976144. The cubic root of 1006897821 is about 1002.2940071737.

The spelling of 1006897821 in words is "one billion, six million, eight hundred ninety-seven thousand, eight hundred twenty-one".