1690901940 has 192 divisors, whose sum is σ = 6170217984. Its totient is φ = 335757312.

The previous prime is 1690901929. The next prime is 1690901969. The reversal of 1690901940 is 491090961.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 83712 + ... + 101928.

It is an arithmetic number, because the mean of its divisors is an integer number (32136552).

Almost surely, 2^1690901940 is an apocalyptic number.

1690901940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1690901940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3085108992).

1690901940 is an abundant number, since it is smaller than the sum of its proper divisors (4479316044).

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

1690901940 is a wasteful number, since it uses less digits than its factorization.

1690901940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18266 (or 18264 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 1690901940 is about 41120.5780601392. The cubic root of 1690901940 is about 1191.3502879827.

The spelling of 1690901940 in words is "one billion, six hundred ninety million, nine hundred one thousand, nine hundred forty".