1297071990 has 24 divisors (see below), whose sum is σ = 3372387408. Its totient is φ = 345885840.

The previous prime is 1297071973. The next prime is 1297072033. The reversal of 1297071990 is 991707921.

It is a super-3 number, since 3×1297071990³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7205866 + ... + 7206045.

It is an arithmetic number, because the mean of its divisors is an integer number (140516142).

Almost surely, 2^1297071990 is an apocalyptic number.

1297071990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1297071990 is an abundant number, since it is smaller than the sum of its proper divisors (2075315418).

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

1297071990 is a wasteful number, since it uses less digits than its factorization.

1297071990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14411924 (or 14411921 counting only the distinct ones).

The product of its (nonzero) digits is 71442, while the sum is 45.

The square root of 1297071990 is about 36014.8856724549. The cubic root of 1297071990 is about 1090.5728801238.

The spelling of 1297071990 in words is "one billion, two hundred ninety-seven million, seventy-one thousand, nine hundred ninety".