40400231 has 4 divisors (see below), whose sum is σ = 40543272. Its totient is φ = 40257192.

The previous prime is 40400221. The next prime is 40400233. The reversal of 40400231 is 13200404.

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-40400231 is a prime.

It is a super-2 number, since 2×40400231² = 3264357329706722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40400233) 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, 71096 + ... + 71661.

It is an arithmetic number, because the mean of its divisors is an integer number (10135818).

Almost surely, 2^40400231 is an apocalyptic number.

40400231 is a deficient number, since it is larger than the sum of its proper divisors (143041).

40400231 is a wasteful number, since it uses less digits than its factorization.

40400231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143040.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 40400231 is about 6356.1176043242. The cubic root of 40400231 is about 343.1320483111.

Adding to 40400231 its reverse (13200404), we get a palindrome (53600635).

The spelling of 40400231 in words is "forty million, four hundred thousand, two hundred thirty-one".