40219091 has 4 divisors (see below), whose sum is σ = 43875384. Its totient is φ = 36562800.

The previous prime is 40219087. The next prime is 40219133. The reversal of 40219091 is 19091204.

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

It is a cyclic number.

It is not a de Polignac number, because 40219091 - 2² = 40219087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40219091.

It is not an unprimeable number, because it can be changed into a prime (40219021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1828130 + ... + 1828151.

It is an arithmetic number, because the mean of its divisors is an integer number (10968846).

Almost surely, 2^40219091 is an apocalyptic number.

40219091 is a deficient number, since it is larger than the sum of its proper divisors (3656293).

40219091 is a wasteful number, since it uses less digits than its factorization.

40219091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3656292.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 40219091 is about 6341.8523319295. The cubic root of 40219091 is about 342.6184533540.

The spelling of 40219091 in words is "forty million, two hundred nineteen thousand, ninety-one".