1974526397 has 2 divisors, whose sum is σ = 1974526398. Its totient is φ = 1974526396.

The previous prime is 1974526373. The next prime is 1974526409. The reversal of 1974526397 is 7936254791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1711145956 + 263380441 = 41366^2 + 16229^2 .

It is a cyclic number.

It is not a de Polignac number, because 1974526397 - 2¹⁶ = 1974460861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1974526297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 987263198 + 987263199.

It is an arithmetic number, because the mean of its divisors is an integer number (987263199).

Almost surely, 2^1974526397 is an apocalyptic number.

It is an amenable number.

1974526397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1974526397 is an equidigital number, since it uses as much as digits as its factorization.

1974526397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2857680, while the sum is 53.

The square root of 1974526397 is about 44435.6433170490. The cubic root of 1974526397 is about 1254.5490561478.

The spelling of 1974526397 in words is "one billion, nine hundred seventy-four million, five hundred twenty-six thousand, three hundred ninety-seven".