40073991 has 4 divisors (see below), whose sum is σ = 53431992. Its totient is φ = 26715992.

The previous prime is 40073987. The next prime is 40073993. The reversal of 40073991 is 19937004.

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 40073991 - 2² = 40073987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40073993) 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, 6678996 + ... + 6679001.

It is an arithmetic number, because the mean of its divisors is an integer number (13357998).

Almost surely, 2^40073991 is an apocalyptic number.

40073991 is a deficient number, since it is larger than the sum of its proper divisors (13358001).

40073991 is a wasteful number, since it uses less digits than its factorization.

40073991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13358000.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 40073991 is about 6330.4021199289. The cubic root of 40073991 is about 342.2059308310.

The spelling of 40073991 in words is "forty million, seventy-three thousand, nine hundred ninety-one".