40204731 has 8 divisors (see below), whose sum is σ = 61264384. Its totient is φ = 22974120.

The previous prime is 40204727. The next prime is 40204733. The reversal of 40204731 is 13740204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40204731 - 2² = 40204727 is a prime.

It is a super-2 number, since 2×40204731² = 3232840789564722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 1914511 = 40204731 / (4 + 0 + 2 + 0 + 4 + 7 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40204698 and 40204707.

It is not an unprimeable number, because it can be changed into a prime (40204733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 957235 + ... + 957276.

It is an arithmetic number, because the mean of its divisors is an integer number (7658048).

Almost surely, 2^40204731 is an apocalyptic number.

40204731 is a deficient number, since it is larger than the sum of its proper divisors (21059653).

40204731 is a wasteful number, since it uses less digits than its factorization.

40204731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1914521.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 40204731 is about 6340.7200695189. The cubic root of 40204731 is about 342.5776718368.

Adding to 40204731 its reverse (13740204), we get a palindrome (53944935).

The spelling of 40204731 in words is "forty million, two hundred four thousand, seven hundred thirty-one".