40290231 has 4 divisors (see below), whose sum is σ = 53720312. Its totient is φ = 26860152.

The previous prime is 40290223. The next prime is 40290247. The reversal of 40290231 is 13209204.

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

It is not a de Polignac number, because 40290231 - 2³ = 40290223 is a prime.

It is a super-2 number, since 2×40290231² = 3246605428066722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40290198 and 40290207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40290281) 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, 6715036 + ... + 6715041.

It is an arithmetic number, because the mean of its divisors is an integer number (13430078).

Almost surely, 2^40290231 is an apocalyptic number.

40290231 is a deficient number, since it is larger than the sum of its proper divisors (13430081).

40290231 is a wasteful number, since it uses less digits than its factorization.

40290231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13430080.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 40290231 is about 6347.4586253082. The cubic root of 40290231 is about 342.8203435455.

Adding to 40290231 its reverse (13209204), we get a palindrome (53499435).

The spelling of 40290231 in words is "forty million, two hundred ninety thousand, two hundred thirty-one".