400243982 has 4 divisors (see below), whose sum is σ = 600365976. Its totient is φ = 200121990.

The previous prime is 400243981. The next prime is 400244021. The reversal of 400243982 is 289342004.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400243981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100060994 + ... + 100060997.

It is an arithmetic number, because the mean of its divisors is an integer number (150091494).

Almost surely, 2^400243982 is an apocalyptic number.

400243982 is a deficient number, since it is larger than the sum of its proper divisors (200121994).

400243982 is a wasteful number, since it uses less digits than its factorization.

400243982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200121993.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 400243982 is about 20006.0986201708. The cubic root of 400243982 is about 736.9560755089.

Adding to 400243982 its reverse (289342004), we get a palindrome (689585986).

The spelling of 400243982 in words is "four hundred million, two hundred forty-three thousand, nine hundred eighty-two".