397726501 has 2 divisors, whose sum is σ = 397726502. Its totient is φ = 397726500.

The previous prime is 397726499. The next prime is 397726507. The reversal of 397726501 is 105627793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 387066276 + 10660225 = 19674^2 + 3265^2 .

It is an emirp because it is prime and its reverse (105627793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397726501 - 2¹ = 397726499 is a prime.

Together with 397726499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397726507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198863250 + 198863251.

It is an arithmetic number, because the mean of its divisors is an integer number (198863251).

Almost surely, 2^397726501 is an apocalyptic number.

It is an amenable number.

397726501 is a deficient number, since it is larger than the sum of its proper divisors (1).

397726501 is an equidigital number, since it uses as much as digits as its factorization.

397726501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 79380, while the sum is 40.

The square root of 397726501 is about 19943.0815322006. The cubic root of 397726501 is about 735.4077062998.

The spelling of 397726501 in words is "three hundred ninety-seven million, seven hundred twenty-six thousand, five hundred one".