40387191 has 16 divisors (see below), whose sum is σ = 59342976. Its totient is φ = 24274656.

The previous prime is 40387183. The next prime is 40387229. The reversal of 40387191 is 19178304.

It is not a de Polignac number, because 40387191 - 2³ = 40387183 is a prime.

It is a super-2 number, since 2×40387191² = 3262250393740962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40387181) 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, 10365 + ... + 13718.

It is an arithmetic number, because the mean of its divisors is an integer number (3708936).

Almost surely, 2^40387191 is an apocalyptic number.

40387191 is a deficient number, since it is larger than the sum of its proper divisors (18955785).

40387191 is a wasteful number, since it uses less digits than its factorization.

40387191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24142.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 40387191 is about 6355.0917381262. The cubic root of 40387191 is about 343.0951267120.

The spelling of 40387191 in words is "forty million, three hundred eighty-seven thousand, one hundred ninety-one".