4020731 has 16 divisors (see below), whose sum is σ = 4881408. Its totient is φ = 3261600.

The previous prime is 4020727. The next prime is 4020733. The reversal of 4020731 is 1370204.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 4020731 - 2² = 4020727 is a prime.

It is a super-2 number, since 2×4020731² = 32332555548722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4020733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3980 + ... + 4886.

It is an arithmetic number, because the mean of its divisors is an integer number (305088).

Almost surely, 2^4020731 is an apocalyptic number.

4020731 is a deficient number, since it is larger than the sum of its proper divisors (860677).

4020731 is a wasteful number, since it uses less digits than its factorization.

4020731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 4020731 is about 2005.1760521211. The cubic root of 4020731 is about 159.0138695495.

Adding to 4020731 its reverse (1370204), we get a palindrome (5390935).

The spelling of 4020731 in words is "four million, twenty thousand, seven hundred thirty-one".