1298944990 has 32 divisors (see below), whose sum is σ = 2673377280. Its totient is φ = 445142304.

The previous prime is 1298944979. The next prime is 1298945017. The reversal of 1298944990 is 994498921.

It is a super-2 number, since 2×1298944990² = 3374516174092200200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 248221 + ... + 253399.

It is an arithmetic number, because the mean of its divisors is an integer number (83543040).

Almost surely, 2^1298944990 is an apocalyptic number.

1298944990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1298944990 is an abundant number, since it is smaller than the sum of its proper divisors (1374432290).

1298944990 is a wasteful number, since it uses less digits than its factorization.

1298944990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8776.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The square root of 1298944990 is about 36040.8794287820. The cubic root of 1298944990 is about 1091.0975645930.

The spelling of 1298944990 in words is "one billion, two hundred ninety-eight million, nine hundred forty-four thousand, nine hundred ninety".