40391090 has 16 divisors (see below), whose sum is σ = 72912960. Its totient is φ = 16110000.

The previous prime is 40391083. The next prime is 40391101. The reversal of 40391090 is 9019304.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 2036 + ... + 9215.

It is an arithmetic number, because the mean of its divisors is an integer number (4557060).

Almost surely, 2^40391090 is an apocalyptic number.

40391090 is a deficient number, since it is larger than the sum of its proper divisors (32521870).

40391090 is a wasteful number, since it uses less digits than its factorization.

40391090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11617.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 40391090 is about 6355.3984926203. The cubic root of 40391090 is about 343.1061672162.

The spelling of 40391090 in words is "forty million, three hundred ninety-one thousand, ninety".