40781899 has 4 divisors (see below), whose sum is σ = 40798264. Its totient is φ = 40765536.

The previous prime is 40781893. The next prime is 40781911. The reversal of 40781899 is 99818704.

It is a happy number.

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 40781899 - 2²¹ = 38684747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40781893) 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, 3582 + ... + 9715.

It is an arithmetic number, because the mean of its divisors is an integer number (10199566).

Almost surely, 2^40781899 is an apocalyptic number.

40781899 is a deficient number, since it is larger than the sum of its proper divisors (16365).

40781899 is a wasteful number, since it uses less digits than its factorization.

40781899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16364.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 40781899 is about 6386.0707011432. The cubic root of 40781899 is about 344.2092060549.

The spelling of 40781899 in words is "forty million, seven hundred eighty-one thousand, eight hundred ninety-nine".