197640425 has 12 divisors (see below), whose sum is σ = 245275596. Its totient is φ = 157982400.

The previous prime is 197640409. The next prime is 197640433. The reversal of 197640425 is 524046791.

It can be written as a sum of positive squares in 6 ways, for example, as 2647129 + 194993296 = 1627^2 + 13964^2 .

It is not a de Polignac number, because 197640425 - 2⁴ = 197640409 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38087 + ... + 42963.

It is an arithmetic number, because the mean of its divisors is an integer number (20439633).

Almost surely, 2^197640425 is an apocalyptic number.

It is an amenable number.

197640425 is a deficient number, since it is larger than the sum of its proper divisors (47635171).

197640425 is a wasteful number, since it uses less digits than its factorization.

197640425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6508 (or 6503 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 197640425 is about 14058.4645320888. The cubic root of 197640425 is about 582.4946305387.

The spelling of 197640425 in words is "one hundred ninety-seven million, six hundred forty thousand, four hundred twenty-five".