699393981 has 32 divisors (see below), whose sum is σ = 1118896128. Its totient is φ = 382933440.

The previous prime is 699393977. The next prime is 699393983. The reversal of 699393981 is 189393996.

It is not a de Polignac number, because 699393981 - 2² = 699393977 is a prime.

It is a super-2 number, since 2×699393981² = 978303881318056722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (699393983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2820 + ... + 37506.

It is an arithmetic number, because the mean of its divisors is an integer number (34965504).

Almost surely, 2^699393981 is an apocalyptic number.

It is an amenable number.

699393981 is a deficient number, since it is larger than the sum of its proper divisors (419502147).

699393981 is a wasteful number, since it uses less digits than its factorization.

699393981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34761.

The product of its digits is 2834352, while the sum is 57.

The square root of 699393981 is about 26446.0579482085. The cubic root of 699393981 is about 887.6476960039.

It can be divided in two parts, 69939 and 3981, that added together give a triangular number (73920 = T₃₈₄).

The spelling of 699393981 in words is "six hundred ninety-nine million, three hundred ninety-three thousand, nine hundred eighty-one".