696409821 has 12 divisors (see below), whose sum is σ = 1015327872. Its totient is φ = 459933576.

The previous prime is 696409787. The next prime is 696409837. The reversal of 696409821 is 128904696.

It is a happy number.

It is not a de Polignac number, because 696409821 - 2⁹ = 696409309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (696409841) 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, 360621 + ... + 362546.

It is an arithmetic number, because the mean of its divisors is an integer number (84610656).

Almost surely, 2^696409821 is an apocalyptic number.

It is an amenable number.

696409821 is a deficient number, since it is larger than the sum of its proper divisors (318918051).

696409821 is a wasteful number, since it uses less digits than its factorization.

696409821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723280 (or 723277 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 696409821 is about 26389.5778859761. The cubic root of 696409821 is about 886.3834304749.

The spelling of 696409821 in words is "six hundred ninety-six million, four hundred nine thousand, eight hundred twenty-one".