40387971 has 16 divisors (see below), whose sum is σ = 61405344. Its totient is φ = 23391744.

The previous prime is 40387969. The next prime is 40387973. The reversal of 40387971 is 17978304.

It is an interprime number because it is at equal distance from previous prime (40387969) and next prime (40387973).

It is not a de Polignac number, because 40387971 - 2¹ = 40387969 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (40387973) 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, 29796 + ... + 31121.

It is an arithmetic number, because the mean of its divisors is an integer number (3837834).

Almost surely, 2^40387971 is an apocalyptic number.

40387971 is a deficient number, since it is larger than the sum of its proper divisors (21017373).

40387971 is a wasteful number, since it uses less digits than its factorization.

40387971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60950.

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

The square root of 40387971 is about 6355.1531059448. The cubic root of 40387971 is about 343.0973354360.

The spelling of 40387971 in words is "forty million, three hundred eighty-seven thousand, nine hundred seventy-one".