3698697981 has 16 divisors (see below), whose sum is σ = 5429286720. Its totient is φ = 2221067520.

The previous prime is 3698697971. The next prime is 3698697983. The reversal of 3698697981 is 1897968963.

It is not a de Polignac number, because 3698697981 - 2⁶ = 3698697917 is a prime.

It is a super-2 number, since 2×3698697981² = 27360733509306952722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3698697983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 510540 + ... + 517733.

It is an arithmetic number, because the mean of its divisors is an integer number (339330420).

Almost surely, 2^3698697981 is an apocalyptic number.

It is an amenable number.

3698697981 is a deficient number, since it is larger than the sum of its proper divisors (1730588739).

3698697981 is a wasteful number, since it uses less digits than its factorization.

3698697981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028396.

The product of its digits is 35271936, while the sum is 66.

The square root of 3698697981 is about 60816.9218310167. The cubic root of 3698697981 is about 1546.4989284119.

The spelling of 3698697981 in words is "three billion, six hundred ninety-eight million, six hundred ninety-seven thousand, nine hundred eighty-one".