40003691 has 8 divisors (see below), whose sum is σ = 49235424. Its totient is φ = 31651200.

The previous prime is 40003679. The next prime is 40003709. The reversal of 40003691 is 19630004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40003691 - 2¹⁸ = 39741547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40003651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219710 + ... + 219891.

It is an arithmetic number, because the mean of its divisors is an integer number (6154428).

Almost surely, 2^40003691 is an apocalyptic number.

40003691 is a deficient number, since it is larger than the sum of its proper divisors (9231733).

40003691 is a wasteful number, since it uses less digits than its factorization.

40003691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439621.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 40003691 is about 6324.8471127767. The cubic root of 40003691 is about 342.0057082138.

Adding to 40003691 its reverse (19630004), we get a palindrome (59633695).

The spelling of 40003691 in words is "forty million, three thousand, six hundred ninety-one".