440309690 has 32 divisors (see below), whose sum is σ = 855029520. Its totient is φ = 162632704.

The previous prime is 440309671. The next prime is 440309699. The reversal of 440309690 is 96903044.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 240963529 + 199346161 = 15523^2 + 14119^2 .

It is a super-2 number, since 2×440309690² = 387745246215792200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 440309690.

It is not an unprimeable number, because it can be changed into a prime (440309699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15425 + ... + 33444.

Almost surely, 2^440309690 is an apocalyptic number.

440309690 is a deficient number, since it is larger than the sum of its proper divisors (414719830).

440309690 is a wasteful number, since it uses less digits than its factorization.

440309690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48946.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 440309690 is about 20983.5576106627. The cubic root of 440309690 is about 760.7688952042.

The spelling of 440309690 in words is "four hundred forty million, three hundred nine thousand, six hundred ninety".