40531387 has 4 divisors (see below), whose sum is σ = 43649200. Its totient is φ = 37413576.

The previous prime is 40531373. The next prime is 40531423. The reversal of 40531387 is 78313504.

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 40531387 - 2⁷ = 40531259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40531367) 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, 1558887 + ... + 1558912.

It is an arithmetic number, because the mean of its divisors is an integer number (10912300).

Almost surely, 2^40531387 is an apocalyptic number.

40531387 is a deficient number, since it is larger than the sum of its proper divisors (3117813).

40531387 is a wasteful number, since it uses less digits than its factorization.

40531387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3117812.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 40531387 is about 6366.4265487006. The cubic root of 40531387 is about 343.5029637990.

The spelling of 40531387 in words is "forty million, five hundred thirty-one thousand, three hundred eighty-seven".