1243168690 has 16 divisors (see below), whose sum is σ = 2369333592. Its totient is φ = 468016384.

The previous prime is 1243168687. The next prime is 1243168691. The reversal of 1243168690 is 968613421.

It can be written as a sum of positive squares in 4 ways, for example, as 801286249 + 441882441 = 28307^2 + 21021^2 .

It is a super-2 number, since 2×1243168690² = 3090936783592632200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1243168691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3656209 + ... + 3656548.

Almost surely, 2^1243168690 is an apocalyptic number.

1243168690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1243168690 is a deficient number, since it is larger than the sum of its proper divisors (1126164902).

1243168690 is a wasteful number, since it uses less digits than its factorization.

1243168690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7312781.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 1243168690 is about 35258.5973912747. The cubic root of 1243168690 is about 1075.2514111814.

The spelling of 1243168690 in words is "one billion, two hundred forty-three million, one hundred sixty-eight thousand, six hundred ninety".