40251986 has 4 divisors (see below), whose sum is σ = 60377982. Its totient is φ = 20125992.

The previous prime is 40251973. The next prime is 40251989. The reversal of 40251986 is 68915204.

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., 39450961 + 801025 = 6281^2 + 895^2 .

It is not an unprimeable number, because it can be changed into a prime (40251989) 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, 10062995 + ... + 10062998.

Almost surely, 2^40251986 is an apocalyptic number.

40251986 is a deficient number, since it is larger than the sum of its proper divisors (20125996).

40251986 is a wasteful number, since it uses less digits than its factorization.

40251986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20125995.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 40251986 is about 6344.4452870208. The cubic root of 40251986 is about 342.7118365580.

It can be divided in two parts, 4025198 and 6, that added together give a palindrome (4025204).

The spelling of 40251986 in words is "forty million, two hundred fifty-one thousand, nine hundred eighty-six".