3420731 has 4 divisors (see below), whose sum is σ = 3424752. Its totient is φ = 3416712.

The previous prime is 3420727. The next prime is 3420749. The reversal of 3420731 is 1370243.

3420731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 3420731 - 2² = 3420727 is a prime.

It is a super-2 number, since 2×3420731² = 23402801148722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3420701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176 + ... + 2621.

It is an arithmetic number, because the mean of its divisors is an integer number (856188).

Almost surely, 2^3420731 is an apocalyptic number.

3420731 is a deficient number, since it is larger than the sum of its proper divisors (4021).

3420731 is a wasteful number, since it uses less digits than its factorization.

3420731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4020.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 3420731 is about 1849.5218300956. The cubic root of 3420731 is about 150.6744591170.

Adding to 3420731 its reverse (1370243), we get a palindrome (4790974).

The spelling of 3420731 in words is "three million, four hundred twenty thousand, seven hundred thirty-one".