40342491 has 24 divisors (see below), whose sum is σ = 70104320. Its totient is φ = 21838896.

The previous prime is 40342481. The next prime is 40342537. The reversal of 40342491 is 19424304.

It is not a de Polignac number, because 40342491 - 2⁶ = 40342427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40342441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15655 + ... + 18048.

Almost surely, 2^40342491 is an apocalyptic number.

40342491 is a deficient number, since it is larger than the sum of its proper divisors (29761829).

40342491 is a wasteful number, since it uses less digits than its factorization.

40342491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33735 (or 33732 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 40342491 is about 6351.5738994363. The cubic root of 40342491 is about 342.9685022940.

Adding to 40342491 its reverse (19424304), we get a palindrome (59766795).

The spelling of 40342491 in words is "forty million, three hundred forty-two thousand, four hundred ninety-one".