40787391 has 8 divisors (see below), whose sum is σ = 54440064. Its totient is φ = 27163160.

The previous prime is 40787387. The next prime is 40787393. The reversal of 40787391 is 19378704.

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

It is a cyclic number.

It is not a de Polignac number, because 40787391 - 2² = 40787387 is a prime.

It is a super-2 number, since 2×40787391² = 3327222529173762, which contains 22 as substring.

It is a plaindrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40787393) 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, 3501 + ... + 9686.

It is an arithmetic number, because the mean of its divisors is an integer number (6805008).

Almost surely, 2^40787391 is an apocalyptic number.

40787391 is a deficient number, since it is larger than the sum of its proper divisors (13652673).

40787391 is a wasteful number, since it uses less digits than its factorization.

40787391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14221.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 40787391 is about 6386.5006850387. The cubic root of 40787391 is about 344.2246566359.

The spelling of 40787391 in words is "forty million, seven hundred eighty-seven thousand, three hundred ninety-one".