1297400850 has 36 divisors (see below), whose sum is σ = 3485684826. Its totient is φ = 345973440.

The previous prime is 1297400803. The next prime is 1297400851. The reversal of 1297400850 is 580047921.

It can be written as a sum of positive squares in 3 ways, for example, as 522168201 + 775232649 = 22851^2 + 27843^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1297400851) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1441107 + ... + 1442006.

Almost surely, 2^1297400850 is an apocalyptic number.

1297400850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1297400850 is an abundant number, since it is smaller than the sum of its proper divisors (2188283976).

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

1297400850 is a wasteful number, since it uses less digits than its factorization.

1297400850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2883131 (or 2883123 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 1297400850 is about 36019.4509952609. The cubic root of 1297400850 is about 1090.6650403879.

The spelling of 1297400850 in words is "one billion, two hundred ninety-seven million, four hundred thousand, eight hundred fifty".