1690481 has 8 divisors (see below), whose sum is σ = 1838760. Its totient is φ = 1544832.

The previous prime is 1690441. The next prime is 1690483. The reversal of 1690481 is 1840961.

It can be written as a sum of positive squares in 4 ways, for example, as 152881 + 1537600 = 391^2 + 1240^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1690481 is a prime.

It is a super-2 number, since 2×1690481² = 5715452022722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1690483) 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, 821 + ... + 2013.

It is an arithmetic number, because the mean of its divisors is an integer number (229845).

2^1690481 is an apocalyptic number.

It is an amenable number.

1690481 is a deficient number, since it is larger than the sum of its proper divisors (148279).

1690481 is a wasteful number, since it uses less digits than its factorization.

1690481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1690481 is about 1300.1849868384. The cubic root of 1690481 is about 119.1251419917.

The spelling of 1690481 in words is "one million, six hundred ninety thousand, four hundred eighty-one".