1957684090 has 16 divisors (see below), whose sum is σ = 3533934600. Its totient is φ = 780828480.

The previous prime is 1957684087. The next prime is 1957684103. The reversal of 1957684090 is 904867591.

It can be written as a sum of positive squares in 4 ways, for example, as 1574581761 + 383102329 = 39681^2 + 19573^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276981 + ... + 283960.

Almost surely, 2^1957684090 is an apocalyptic number.

1957684090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1957684090 is a deficient number, since it is larger than the sum of its proper divisors (1576250510).

1957684090 is a wasteful number, since it uses less digits than its factorization.

1957684090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561297.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 1957684090 is about 44245.7239741876. The cubic root of 1957684090 is about 1250.9718500768.

The spelling of 1957684090 in words is "one billion, nine hundred fifty-seven million, six hundred eighty-four thousand, ninety".