1954840025 has 18 divisors (see below), whose sum is σ = 2484922986. Its totient is φ = 1524624000.

The previous prime is 1954840021. The next prime is 1954840049. The reversal of 1954840025 is 5200484591.

It can be written as a sum of positive squares in 9 ways, for example, as 1127012041 + 827827984 = 33571^2 + 28772^2 .

It is not a de Polignac number, because 1954840025 - 2² = 1954840021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1954840021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1414835 + ... + 1416215.

It is an arithmetic number, because the mean of its divisors is an integer number (138051277).

Almost surely, 2^1954840025 is an apocalyptic number.

It is an amenable number.

1954840025 is a deficient number, since it is larger than the sum of its proper divisors (530082961).

1954840025 is an frugal number, since it uses more digits than its factorization.

1954840025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2813 (or 1427 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 1954840025 is about 44213.5728594738. The cubic root of 1954840025 is about 1250.3657649624.

The spelling of 1954840025 in words is "one billion, nine hundred fifty-four million, eight hundred forty thousand, twenty-five".