100390681 has 8 divisors (see below), whose sum is σ = 103067360. Its totient is φ = 97729632.

The previous prime is 100390651. The next prime is 100390691. The reversal of 100390681 is 186093001.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 100390681 - 2¹³ = 100382489 is a prime.

It is a super-2 number, since 2×100390681² = 20156577663287522, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (100390621) 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, 9730 + ... + 17188.

It is an arithmetic number, because the mean of its divisors is an integer number (12883420).

Almost surely, 2^100390681 is an apocalyptic number.

It is an amenable number.

100390681 is a deficient number, since it is larger than the sum of its proper divisors (2676679).

100390681 is an equidigital number, since it uses as much as digits as its factorization.

100390681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7815.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 100390681 is about 10019.5150082227. The cubic root of 100390681 is about 464.7625580840.

The spelling of 100390681 in words is "one hundred million, three hundred ninety thousand, six hundred eighty-one".