40426391 has 4 divisors (see below), whose sum is σ = 42804432. Its totient is φ = 38048352.

The previous prime is 40426349. The next prime is 40426403. The reversal of 40426391 is 19362404.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40426391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40426891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1188995 + ... + 1189028.

It is an arithmetic number, because the mean of its divisors is an integer number (10701108).

Almost surely, 2^40426391 is an apocalyptic number.

40426391 is a deficient number, since it is larger than the sum of its proper divisors (2378041).

40426391 is a wasteful number, since it uses less digits than its factorization.

40426391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2378040.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 40426391 is about 6358.1751312778. The cubic root of 40426391 is about 343.2060940728.

Adding to 40426391 its reverse (19362404), we get a palindrome (59788795).

The spelling of 40426391 in words is "forty million, four hundred twenty-six thousand, three hundred ninety-one".