40257987 has 32 divisors (see below), whose sum is σ = 68043264. Its totient is φ = 20563200.

The previous prime is 40257983. The next prime is 40258013. The reversal of 40257987 is 78975204.

It is not a de Polignac number, because 40257987 - 2² = 40257983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40257983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12663 + ... + 15519.

It is an arithmetic number, because the mean of its divisors is an integer number (2126352).

Almost surely, 2^40257987 is an apocalyptic number.

40257987 is a deficient number, since it is larger than the sum of its proper divisors (27785277).

40257987 is a wasteful number, since it uses less digits than its factorization.

40257987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2939.

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 40257987 is about 6344.9182027824. The cubic root of 40257987 is about 342.7288668692.

The spelling of 40257987 in words is "forty million, two hundred fifty-seven thousand, nine hundred eighty-seven".