1690661973 has 144 divisors (see below), whose sum is σ = 3190161408. Its totient is φ = 778377600.

The previous prime is 1690661899. The next prime is 1690661977. The reversal of 1690661973 is 3791660961.

It is not a de Polignac number, because 1690661973 - 2¹⁰ = 1690660949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1690661977) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 13312236 + ... + 13312362.

Almost surely, 2^1690661973 is an apocalyptic number.

1690661973 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1690661973 is a deficient number, since it is larger than the sum of its proper divisors (1499499435).

1690661973 is a wasteful number, since it uses less digits than its factorization.

1690661973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 367416, while the sum is 48.

The square root of 1690661973 is about 41117.6601109548. The cubic root of 1690661973 is about 1191.2939278685.

The spelling of 1690661973 in words is "one billion, six hundred ninety million, six hundred sixty-one thousand, nine hundred seventy-three".