1245897 has 6 divisors (see below), whose sum is σ = 1799642. Its totient is φ = 830592.

The previous prime is 1245883. The next prime is 1245917. The reversal of 1245897 is 7985421.

It can be written as a sum of positive squares in only one way, i.e., 1245456 + 441 = 1116^2 + 21^2 .

It is not a de Polignac number, because 1245897 - 2⁶ = 1245833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1245817) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69208 + ... + 69225.

2^1245897 is an apocalyptic number.

It is an amenable number.

1245897 is a deficient number, since it is larger than the sum of its proper divisors (553745).

1245897 is a wasteful number, since it uses less digits than its factorization.

1245897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138439 (or 138436 counting only the distinct ones).

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

The square root of 1245897 is about 1116.1975631581. The cubic root of 1245897 is about 107.6037433688.

It can be divided in two parts, 1245 and 897, that multiplied together give a triangular number (1116765 = T₁₄₉₄).

The spelling of 1245897 in words is "one million, two hundred forty-five thousand, eight hundred ninety-seven".