1945397 has 4 divisors (see below), whose sum is σ = 1949376. Its totient is φ = 1941420.

The previous prime is 1945393. The next prime is 1945399. The reversal of 1945397 is 7935491.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1945397 - 2² = 1945393 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1945397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1945393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1133 + ... + 2274.

It is an arithmetic number, because the mean of its divisors is an integer number (487344).

2^1945397 is an apocalyptic number.

It is an amenable number.

1945397 is a deficient number, since it is larger than the sum of its proper divisors (3979).

1945397 is an equidigital number, since it uses as much as digits as its factorization.

1945397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3978.

The product of its digits is 34020, while the sum is 38.

The square root of 1945397 is about 1394.7748922317. The cubic root of 1945397 is about 124.8349180797.

The spelling of 1945397 in words is "one million, nine hundred forty-five thousand, three hundred ninety-seven".