400230981 has 24 divisors (see below), whose sum is σ = 604169280. Its totient is φ = 254829696.

The previous prime is 400230977. The next prime is 400230997. The reversal of 400230981 is 189032004.

It is not a de Polignac number, because 400230981 - 2² = 400230977 is a prime.

It is a super-2 number, since 2×400230981² = 320369676304444722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400230581) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 201250 + ... + 203228.

It is an arithmetic number, because the mean of its divisors is an integer number (25173720).

Almost surely, 2^400230981 is an apocalyptic number.

It is an amenable number.

400230981 is a deficient number, since it is larger than the sum of its proper divisors (203938299).

400230981 is a wasteful number, since it uses less digits than its factorization.

400230981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2985 (or 2982 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 400230981 is about 20005.7736916121. The cubic root of 400230981 is about 736.9480959846.

Adding to 400230981 its reverse (189032004), we get a palindrome (589262985).

The spelling of 400230981 in words is "four hundred million, two hundred thirty thousand, nine hundred eighty-one".