1690938 has 12 divisors (see below), whose sum is σ = 3663738. Its totient is φ = 563640.

The previous prime is 1690933. The next prime is 1690967. The reversal of 1690938 is 8390961.

It can be written as a sum of positive squares in only one way, i.e., 1580049 + 110889 = 1257^2 + 333^2 .

It is not an unprimeable number, because it can be changed into a prime (1690933) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46953 + ... + 46988.

2^1690938 is an apocalyptic number.

1690938 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1690938 is an abundant number, since it is smaller than the sum of its proper divisors (1972800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1690938 is a wasteful number, since it uses less digits than its factorization.

1690938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93949 (or 93946 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 1690938 is about 1300.3607191853. The cubic root of 1690938 is about 119.1358756794.

It can be divided in two parts, 1690 and 938, that added together give a triangular number (2628 = T₇₂).

The spelling of 1690938 in words is "one million, six hundred ninety thousand, nine hundred thirty-eight".