2500000397 has 2 divisors, whose sum is σ = 2500000398. Its totient is φ = 2500000396.

The previous prime is 2500000381. The next prime is 2500000427. The reversal of 2500000397 is 7930000052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1976780521 + 523219876 = 44461^2 + 22874^2 .

It is a cyclic number.

It is not a de Polignac number, because 2500000397 - 2⁴ = 2500000381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2500002397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1250000198 + 1250000199.

It is an arithmetic number, because the mean of its divisors is an integer number (1250000199).

Almost surely, 2^2500000397 is an apocalyptic number.

It is an amenable number.

2500000397 is a deficient number, since it is larger than the sum of its proper divisors (1).

2500000397 is an equidigital number, since it uses as much as digits as its factorization.

2500000397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1890, while the sum is 26.

The square root of 2500000397 is about 50000.0039699998. The cubic root of 2500000397 is about 1357.2088801390.

The spelling of 2500000397 in words is "two billion, five hundred million, three hundred ninety-seven", and thus it is an aban number.