40208690 has 8 divisors (see below), whose sum is σ = 72375660. Its totient is φ = 16083472.

The previous prime is 40208657. The next prime is 40208713. The reversal of 40208690 is 9680204.

It can be written as a sum of positive squares in 2 ways, for example, as 39601849 + 606841 = 6293^2 + 779^2 .

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

It is a super-2 number, since 2×40208690² = 3233477503032200, which contains 22 as substring.

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, 2010425 + ... + 2010444.

Almost surely, 2^40208690 is an apocalyptic number.

40208690 is a deficient number, since it is larger than the sum of its proper divisors (32166970).

40208690 is a wasteful number, since it uses less digits than its factorization.

40208690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4020876.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 40208690 is about 6341.0322503517. The cubic root of 40208690 is about 342.5889161228.

Adding to 40208690 its reverse (9680204), we get a palindrome (49888894).

The spelling of 40208690 in words is "forty million, two hundred eight thousand, six hundred ninety".