40309802 has 8 divisors (see below), whose sum is σ = 65115876. Its totient is φ = 18604512.

The previous prime is 40309793. The next prime is 40309817. The reversal of 40309802 is 20890304.

It is a Cunningham number, because it is equal to 6349²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 40309801 + 1 = 6349^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 1550377 = 40309802 / (4 + 0 + 3 + 0 + 9 + 8 + 0 + 2).

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 775163 + ... + 775214.

Almost surely, 2^40309802 is an apocalyptic number.

40309802 is a deficient number, since it is larger than the sum of its proper divisors (24806074).

40309802 is a wasteful number, since it uses less digits than its factorization.

40309802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550392.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 40309802 is about 6349.0000787526. Note that the first 4 decimals coincide. The cubic root of 40309802 is about 342.8758429450.

The spelling of 40309802 in words is "forty million, three hundred nine thousand, eight hundred two".