40387898 has 4 divisors (see below), whose sum is σ = 60581850. Its totient is φ = 20193948.

The previous prime is 40387891. The next prime is 40387927. The reversal of 40387898 is 89878304.

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

It can be written as a sum of positive squares in only one way, i.e., 23107249 + 17280649 = 4807^2 + 4157^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40387891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10096973 + ... + 10096976.

Almost surely, 2^40387898 is an apocalyptic number.

40387898 is a deficient number, since it is larger than the sum of its proper divisors (20193952).

40387898 is a wasteful number, since it uses less digits than its factorization.

40387898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20193951.

The product of its (nonzero) digits is 387072, while the sum is 47.

The square root of 40387898 is about 6355.1473625715. The cubic root of 40387898 is about 343.0971287233.

The spelling of 40387898 in words is "forty million, three hundred eighty-seven thousand, eight hundred ninety-eight".