1601690 has 8 divisors (see below), whose sum is σ = 2883060. Its totient is φ = 640672.

The previous prime is 1601687. The next prime is 1601711. The reversal of 1601690 is 961061.

It can be written as a sum of positive squares in 2 ways, for example, as 1471369 + 130321 = 1213^2 + 361^2 .

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

It is a super-2 number, since 2×1601690² = 5130821712200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80075 + ... + 80094.

2^1601690 is an apocalyptic number.

1601690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1601690 is a deficient number, since it is larger than the sum of its proper divisors (1281370).

1601690 is a wasteful number, since it uses less digits than its factorization.

1601690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160176.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 1601690 is about 1265.5789189142. The cubic root of 1601690 is about 117.0018749547.

It can be divided in two parts, 160 and 1690, that multiplied together give a square (270400 = 520²).

The spelling of 1601690 in words is "one million, six hundred one thousand, six hundred ninety".