400301981 has 8 divisors (see below), whose sum is σ = 404798784. Its totient is φ = 395817120.

The previous prime is 400301971. The next prime is 400302053. The reversal of 400301981 is 189103004.

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 400301981 - 2⁶ = 400301917 is a prime.

It is a super-2 number, since 2×400301981² = 320483351985048722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400301981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400301971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75830 + ... + 80936.

It is an arithmetic number, because the mean of its divisors is an integer number (50599848).

Almost surely, 2^400301981 is an apocalyptic number.

It is an amenable number.

400301981 is a deficient number, since it is larger than the sum of its proper divisors (4496803).

400301981 is a wasteful number, since it uses less digits than its factorization.

400301981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5971.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 400301981 is about 20007.5481006544. The cubic root of 400301981 is about 736.9916710064.

Adding to 400301981 its reverse (189103004), we get a palindrome (589404985).

The spelling of 400301981 in words is "four hundred million, three hundred one thousand, nine hundred eighty-one".