40351669 has 4 divisors (see below), whose sum is σ = 40608844. Its totient is φ = 40094496.

The previous prime is 40351657. The next prime is 40351681. The reversal of 40351669 is 96615304.

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

It is an interprime number because it is at equal distance from previous prime (40351657) and next prime (40351681).

It can be written as a sum of positive squares in 2 ways, for example, as 5008644 + 35343025 = 2238^2 + 5945^2 .

It is a cyclic number.

It is not a de Polignac number, because 40351669 - 2²⁵ = 6797237 is a prime.

It is a super-2 number, since 2×40351669² = 3256514382171122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40351609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128352 + ... + 128665.

It is an arithmetic number, because the mean of its divisors is an integer number (10152211).

Almost surely, 2^40351669 is an apocalyptic number.

40351669 is the 3668-th hex number.

It is an amenable number.

40351669 is a deficient number, since it is larger than the sum of its proper divisors (257175).

40351669 is a wasteful number, since it uses less digits than its factorization.

40351669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257174.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 40351669 is about 6352.2963564368. The cubic root of 40351669 is about 342.9945090027.

The spelling of 40351669 in words is "forty million, three hundred fifty-one thousand, six hundred sixty-nine".