3390781 has 4 divisors (see below), whose sum is σ = 3454812. Its totient is φ = 3326752.

The previous prime is 3390763. The next prime is 3390787. The reversal of 3390781 is 1870933.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2160900 + 1229881 = 1470^2 + 1109^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3390781 is a prime.

It is a super-2 number, since 2×3390781² = 22994791579922, 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 (3390787) 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, 31936 + ... + 32041.

It is an arithmetic number, because the mean of its divisors is an integer number (863703).

Almost surely, 2^3390781 is an apocalyptic number.

It is an amenable number.

3390781 is a deficient number, since it is larger than the sum of its proper divisors (64031).

3390781 is an equidigital number, since it uses as much as digits as its factorization.

3390781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64030.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 3390781 is about 1841.4073422250. The cubic root of 3390781 is about 150.2334291431.

The spelling of 3390781 in words is "three million, three hundred ninety thousand, seven hundred eighty-one".