1039721690 has 24 divisors (see below), whose sum is σ = 2177050932. Its totient is φ = 356475840.

The previous prime is 1039721681. The next prime is 1039721707. The reversal of 1039721690 is 961279301.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1000646689 + 39075001 = 31633^2 + 6251^2 .

It is a super-2 number, since 2×1039721690² = 2162042385312912200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1060451 + ... + 1061430.

Almost surely, 2^1039721690 is an apocalyptic number.

1039721690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1039721690 is an abundant number, since it is smaller than the sum of its proper divisors (1137329242).

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

1039721690 is a wasteful number, since it uses less digits than its factorization.

1039721690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121902 (or 2121895 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 1039721690 is about 32244.7156911020. The cubic root of 1039721690 is about 1013.0690199901.

The spelling of 1039721690 in words is "one billion, thirty-nine million, seven hundred twenty-one thousand, six hundred ninety".