693981 has 8 divisors (see below), whose sum is σ = 1028160. Its totient is φ = 462636.

The previous prime is 693967. The next prime is 693989. The reversal of 693981 is 189396.

It is not a de Polignac number, because 693981 - 2¹⁰ = 692957 is a prime.

It is a super-2 number, since 2×693981² = 963219256722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (693989) 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, 12825 + ... + 12878.

It is an arithmetic number, because the mean of its divisors is an integer number (128520).

2⁶⁹³⁹⁸¹ is an apocalyptic number.

It is an amenable number.

693981 is a deficient number, since it is larger than the sum of its proper divisors (334179).

693981 is a wasteful number, since it uses less digits than its factorization.

693981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25712 (or 25706 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 693981 is about 833.0552202585. The cubic root of 693981 is about 88.5351770530.

The spelling of 693981 in words is "six hundred ninety-three thousand, nine hundred eighty-one".