1897978037 has 2 divisors, whose sum is σ = 1897978038. Its totient is φ = 1897978036.

The previous prime is 1897978003. The next prime is 1897978063. The reversal of 1897978037 is 7308797981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1897560721 + 417316 = 43561^2 + 646^2 .

It is a cyclic number.

It is not a de Polignac number, because 1897978037 - 2¹⁶ = 1897912501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1897978097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 948989018 + 948989019.

It is an arithmetic number, because the mean of its divisors is an integer number (948989019).

Almost surely, 2^1897978037 is an apocalyptic number.

It is an amenable number.

1897978037 is a deficient number, since it is larger than the sum of its proper divisors (1).

1897978037 is an equidigital number, since it uses as much as digits as its factorization.

1897978037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5334336, while the sum is 59.

The square root of 1897978037 is about 43565.7897552655. The cubic root of 1897978037 is about 1238.1228180354.

The spelling of 1897978037 in words is "one billion, eight hundred ninety-seven million, nine hundred seventy-eight thousand, thirty-seven".