40144666 has 4 divisors (see below), whose sum is σ = 60217002. Its totient is φ = 20072332.

The previous prime is 40144639. The next prime is 40144679. The reversal of 40144666 is 66644104.

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., 34987225 + 5157441 = 5915^2 + 2271^2 .

It is a super-2 number, since 2×40144666² = 3223188416503112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10036165 + ... + 10036168.

Almost surely, 2^40144666 is an apocalyptic number.

40144666 is a deficient number, since it is larger than the sum of its proper divisors (20072336).

40144666 is a wasteful number, since it uses less digits than its factorization.

40144666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20072335.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 40144666 is about 6335.9818497215. The cubic root of 40144666 is about 342.4069855931.

The spelling of 40144666 in words is "forty million, one hundred forty-four thousand, six hundred sixty-six".