1237645397 has 2 divisors, whose sum is σ = 1237645398. Its totient is φ = 1237645396.

The previous prime is 1237645369. The next prime is 1237645417. The reversal of 1237645397 is 7935467321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 678133681 + 559511716 = 26041^2 + 23654^2 .

It is a cyclic number.

It is not a de Polignac number, because 1237645397 - 2¹⁸ = 1237383253 is a prime.

It is a super-2 number, since 2×1237645397² = 3063532257430575218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1237645697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 618822698 + 618822699.

It is an arithmetic number, because the mean of its divisors is an integer number (618822699).

Almost surely, 2^1237645397 is an apocalyptic number.

It is an amenable number.

1237645397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1237645397 is an equidigital number, since it uses as much as digits as its factorization.

1237645397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 47.

The square root of 1237645397 is about 35180.1847209477. The cubic root of 1237645397 is about 1073.6566300924.

The spelling of 1237645397 in words is "one billion, two hundred thirty-seven million, six hundred forty-five thousand, three hundred ninety-seven".