40381887 has 16 divisors (see below), whose sum is σ = 66268160. Its totient is φ = 21300192.

The previous prime is 40381879. The next prime is 40381927. The reversal of 40381887 is 78818304.

It is not a de Polignac number, because 40381887 - 2³ = 40381879 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40381387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73687 + ... + 74232.

It is an arithmetic number, because the mean of its divisors is an integer number (4141760).

Almost surely, 2^40381887 is an apocalyptic number.

40381887 is a deficient number, since it is larger than the sum of its proper divisors (25886273).

40381887 is a wasteful number, since it uses less digits than its factorization.

40381887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147942.

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 40381887 is about 6354.6744212430. The cubic root of 40381887 is about 343.0801066345.

The spelling of 40381887 in words is "forty million, three hundred eighty-one thousand, eight hundred eighty-seven".