1251397 has 12 divisors (see below), whose sum is σ = 1521120. Its totient is φ = 1005696.

The previous prime is 1251329. The next prime is 1251409. The reversal of 1251397 is 7931521.

It is a de Polignac number, because none of the positive numbers 2^k-1251397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251307) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12853 + ... + 12949.

It is an arithmetic number, because the mean of its divisors is an integer number (126760).

2^1251397 is an apocalyptic number.

It is an amenable number.

1251397 is a deficient number, since it is larger than the sum of its proper divisors (269723).

1251397 is an frugal number, since it uses more digits than its factorization.

1251397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220 (or 123 counting only the distinct ones).

The product of its digits is 1890, while the sum is 28.

The square root of 1251397 is about 1118.6585716831. The cubic root of 1251397 is about 107.7618494980.

The spelling of 1251397 in words is "one million, two hundred fifty-one thousand, three hundred ninety-seven".