40228991 has 6 divisors (see below), whose sum is σ = 44218776. Its totient is φ = 36571700.

The previous prime is 40228949. The next prime is 40228999. The reversal of 40228991 is 19982204.

It is not a de Polignac number, because 40228991 - 2⁶ = 40228927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40228999) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 166115 + ... + 166356.

It is an arithmetic number, because the mean of its divisors is an integer number (7369796).

Almost surely, 2^40228991 is an apocalyptic number.

40228991 is a deficient number, since it is larger than the sum of its proper divisors (3989785).

40228991 is a wasteful number, since it uses less digits than its factorization.

40228991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332493 (or 332482 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 40228991 is about 6342.6328129571. The cubic root of 40228991 is about 342.6465630927.

The spelling of 40228991 in words is "forty million, two hundred twenty-eight thousand, nine hundred ninety-one".