1297513990 has 32 divisors (see below), whose sum is σ = 2537763840. Its totient is φ = 475826400.

The previous prime is 1297513963. The next prime is 1297513991. The reversal of 1297513990 is 993157921.

It is a self number, because there is not a number n which added to its sum of digits gives 1297513990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1297513991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104256 + ... + 116035.

It is an arithmetic number, because the mean of its divisors is an integer number (79305120).

Almost surely, 2^1297513990 is an apocalyptic number.

1297513990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1297513990 is a deficient number, since it is larger than the sum of its proper divisors (1240249850).

1297513990 is a wasteful number, since it uses less digits than its factorization.

1297513990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220348.

The product of its (nonzero) digits is 153090, while the sum is 46.

The square root of 1297513990 is about 36021.0215013400. The cubic root of 1297513990 is about 1090.6967433258.

The spelling of 1297513990 in words is "one billion, two hundred ninety-seven million, five hundred thirteen thousand, nine hundred ninety".