1825390397 has 4 divisors (see below), whose sum is σ = 1869912156. Its totient is φ = 1780868640.

The previous prime is 1825390393. The next prime is 1825390417. The reversal of 1825390397 is 7930935281.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 110271001 + 1715119396 = 10501^2 + 41414^2 .

It is a cyclic number.

It is not a de Polignac number, because 1825390397 - 2² = 1825390393 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 (1825390393) 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, 22260818 + ... + 22260899.

It is an arithmetic number, because the mean of its divisors is an integer number (467478039).

Almost surely, 2^1825390397 is an apocalyptic number.

It is an amenable number.

1825390397 is a deficient number, since it is larger than the sum of its proper divisors (44521759).

1825390397 is an equidigital number, since it uses as much as digits as its factorization.

1825390397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44521758.

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 1825390397 is about 42724.5877335288. The cubic root of 1825390397 is about 1222.1333266882.

The spelling of 1825390397 in words is "one billion, eight hundred twenty-five million, three hundred ninety thousand, three hundred ninety-seven".