40297489 has 4 divisors (see below), whose sum is σ = 41597440. Its totient is φ = 38997540.

The previous prime is 40297487. The next prime is 40297507. The reversal of 40297489 is 98479204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40297489 - 2¹ = 40297487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40297483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 649929 + ... + 649990.

It is an arithmetic number, because the mean of its divisors is an integer number (10399360).

Almost surely, 2^40297489 is an apocalyptic number.

It is an amenable number.

40297489 is a deficient number, since it is larger than the sum of its proper divisors (1299951).

40297489 is a wasteful number, since it uses less digits than its factorization.

40297489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299950.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 40297489 is about 6348.0303244392. The cubic root of 40297489 is about 342.8409278624.

The spelling of 40297489 in words is "forty million, two hundred ninety-seven thousand, four hundred eighty-nine".